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    Wyświetlanie 1-48 z 48
    Tytuł:
    The Mössbauer spectrometer MsAa-4
    Autorzy:
    Górnicki, R.
    Ruebenbauer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147400.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-ray spectroscopy
    Mössbauer spectroscopy
    spectrometers
    Opis:
    A description of the Mossbauer spectrometer MsAa-4 is given. The spectrometer has a modular design and it could be used as the gamma-ray spectrometer as well. It has almost entirely digital design to assure stability and repeatability. It is powered via the rechargeable battery to make it immune to the power failures. All settings are performed remotely over the Ethernet link used also to transfer data and spectrometer functions. External CAN bus could be used to attach auxiliary equipment. The status of the external equipment could be used to control spectrometer functions. Internal digital oscilloscope monitors vital functions of the spectrometer over the Ethernet link. Driving software operates under Microsoft Windows registered trademark systems and it is fully compatible with the Mosgraf-2009 data processing suite.
    Źródło:
    Nukleonika; 2013, 58, 1; 17-21
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of High-Energy Laser coupled with Gamma – Lonizing Irradiations as New Sterilizing Technique
    Autorzy:
    Elsabawy, Khaled M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192077.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nd-Laser
    Gamma-ray
    Sterilizing
    X-Ray
    SEM
    AFM
    Opis:
    The present investigations introduce for first time new trend of coupling of two sterilizing sources, high energy Nd-Laser and Gamma – irradiations which has oxidative nature by additional to its thermal effects. The investigated samples will be examined before and after radiations to confirm its internal structure (XRD, microstructure (SEM, AFM, Raman-Spectra) and killing ratio for polluted bacteria. Furthermore some selected biological tests will be checked to be sure from toxicity ratio after radiations. Also many of investigational parameters will be tested such as strength of irradiation dose and irradiation dosage time to achieve maximum healthy sterilizing ratio per minimum time to validate application and wide scale application of this promising sterilizing technique.
    Źródło:
    World Scientific News; 2016, 37; 61-75
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A modified method for the determination of radioactive isotopes in building raw and construction materials with multichannel gamma spectrometry
    Autorzy:
    Charewicz, W.
    Żebrowski, A.
    Walkowiak, W.
    Borek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147083.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    building materials
    multichannel gamma-ray spectrometry
    radioactive isotopes
    Opis:
    A modified method is presented for the determination of natural and artificial isotopes in building raws and materials using multichannel gamma-ray spectrometry. A procedure is given for the preparation of standards as well as for the determination of radioisotopes content in typical building raws and/or materials. Results of these determinations were compared with those from standard, tri-channel gamma spectrometry described in Instruction No. 234/95 [2] issued by the Institute of Building Technology in Warsaw, Poland.
    Źródło:
    Nukleonika; 2000, 45, 4; 243-247
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prompt gamma-ray methods for industrial process evaluation : a simulation study
    Autorzy:
    Mohammed, Mohammed Siddig H.
    Alhawsawi, Abdulsalam M.
    Aljohani, M. S.
    Damoom, Mohammed M.
    Banoqitah, Essam M.
    Elmoujarkach, Ezzat
    Powiązania:
    https://bibliotekanauki.pl/articles/2105331.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    prompt gamma ray
    sealed sources
    radiotracers
    industrial process
    Opis:
    Radioisotope applications in industrial process inspection and evaluation using gamma-ray emitters provide otherwise unavailable information. Offering alternative gamma-ray sources can support the technology by complementing sources’ availability and radiation safety. This work proposes to replace gamma-ray from radioisotopes with prompt gamma-ray from the interaction of neutrons with stable isotopes injected into the industrial process or with the structural material of the industrial process equipment. Monte Carlo N-Particle Transport Code (MCNP5) was used to simulate the irradiation of two-phase fl ow pipes by 252Cf neutron source. Two simulations were run for each pipe, with and without mixing the liquid phase with the stable isotope 157Gd. The detected gamma-ray spectra were analysed, and images of the two phases inside the pipes were produced. The images were compared to images obtained from simulations of gamma transmission measurement using 60Co. Furthermore, results for prompt gamma computed tomography (CT) were presented and discussed. The studies’ outcomes indicate the potential of prompt gamma-ray to carry out the sealed sources applications of gamma transmission measurements and imaging.
    Źródło:
    Nukleonika; 2022, 67, 1; 11--18
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pochłanianie promieniowania gamma w taśmach przenośnikowych jako czynnik ograniczający stosowanie urządzeń izotopowych
    Absorption of gamma ray in conveyor belts as a limiting factor of applying devices with radioactive sources
    Autorzy:
    Bonczyk, M.
    Michalik, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/164972.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    taśmy przenośnikowe
    absorpcja promieniowania gamma
    conveyor belts
    absorption of gamma ray
    Opis:
    Rozmaite metody izotopowe stosowane w systemach automatyki kontrolno-pomiarowej wykorzystywane są niemal we wszystkich gałęziach przemysłu, szczególnie w górnictwie i energetyce. Ich zaletą jest mnogość zastosowań oraz łatwość użycia, co jednocześnie rzutuje na ich dużą niezawodność. Wykorzystywane są miedzy innymi przy badaniu przepływów, poziomów cieczy w zbiornikach, w pomiarach gęstości i masy (tzw. wagi izotopowe) czy w systemach wykonujących ciągły pomiar zawartości popiołu w węglu (tzw. popiołomierze absorpcyjne). Idea badania gęstości, masy czy zawartości popiołu polega na pomiarze wielkości osłabienia wiązki promieniowania gamma przechodzącej przez badany obiekt. Dzięki zastosowaniu odpowiedniej kalibracji takiego systemu pomiarowego można uzyskać zależność funkcyjną między wielkością osłabienia a wymienionymi parametrami. Trudność tego typu badań polega na tym, że w typowym układzie pomiarowym, wiązka promieniowania gamma przechodzi nie tylko przez badany obiekt, ale również przez taśmę transportera, której obecność istotnie wpływa na wynik pomiaru. Dzieje się tak dlatego, że pewna część promieniowania zostaje pochłonięta już w taśmie. Praca traktuje o wpływie obecności taśm transporterowych na wyniki pomiarów urządzeniami wykorzystującymi źródła promieniotwórcze.
    Industrial automation systems with radioactive sources are applied in almost all branches of industry, especially in the mining and energy ones. They are very easy to apply and strongly reliable. Radioactive sources are used in measuring the flow, levels of media in containers, density, mass and ash content in coal. These measurements relay on measurement of gamma- -ray absorption which is the matter of concern. After appropriate calibration of such a measurement system, one is able to obtain relationship between absorption of radiation and mass or ash content. The major difficulty is additional absorption in conveyor belts. This additional absorption in belts usually is non-negligible. The presented work describes the influence of additional absorption in conveyor belts on the results of measurements which are performed by use of the devices with radioactive sources.
    Źródło:
    Przegląd Górniczy; 2015, 71, 12; 36-40
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-absorption correction in gamma-ray spectrometry of environmental samples - an overview of methods and correction values obtained for the selected geometries
    Autorzy:
    Jodłowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/148531.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-ray spectrometry
    self-attenuation
    self-absorption
    correction factor
    Opis:
    Of major concern are the self-absorption correction factors Cs in precise gamma-ray spectrometry of environmental samples. The overview of Cs determination methods (experimental, Monte Carlo calculations, analytical function application) is presented. Among several available methods, the author chose the one proposed by Debertin where the uncertainty level of Cs correction factor is 1÷2%. The point-like detector model is assumed whilst its efficiency is taken to be proportional to the weighted sum (integral) of the number of photons coming from sample volume elements. Computer program was developed to support the computation of Cs by the Debertin's method for samples in cylindrical geometries and Marinelli beakers. The input data are sample dimensions, density and the mass attenuation coefficient. The Cs uncertainty due to an arbitrarily chosen position of a point-like detector would not exceed 1% for the considered photon energies and the sample density range. Utilising this computer program, the relationships Cs(E,ń) were obtained for the applied geometries and a SiO2 matrix to support routine measurements. The SiO2 matrix is widely encountered in environmental spectrometry. This relationship was derived by fitting the computed data with the function Cs(E,ń) in the form proposed by Bolivar. It was shown that while handling this function to samples with the H2O matrix, the error involved in estimations would not exceed 3%.
    Źródło:
    Nukleonika; 2006, 51,suppl.2; 21-25
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi phase flow measurements with the application of ECT/ERT DECART multimodality tomograph
    Pomiary przepływów wielofazowych z wykorzystaniem tomografu multimodalnego DECART
    Autorzy:
    Nowakowski, J.
    Banasiak, R.
    Wajman, R.
    Sankowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/408319.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    tomography
    electrical capacitance tomography
    gamma ray
    tomografia
    elektryczna tomografia pojemnościowa
    promieniowanie gamma
    Opis:
    The multi-phase flow measurements are very important tasks in many areas of industrial processes applications. One of them is undersea exploration of oil in the petroleum industry. The submitted paper presents application of DECART tomograph designed and built in Lodz University of Technology - together with combined measurements of signals acquired from gamma ray measurement system. Use of all measuring modalities allowed for performing measurements of a flow composed of sea water, oil and gas. The paper presents theoretical principles applied to design multimodality tomograph and results of experiments performed in the University of Bergen. Measurement confirmed that multi-modality approach allows giving fast and reliable on-line results of measurements of composition of multi-phase flow. Applied algorithms allowed to speed up on-line measurements and presenting results in a form required in industrial applications. The derived conclusions can be used as guidelines for preparation of industrial applicable construction of tomograph.
    Pomiary przepływów wielofazowych są szeroko wykorzystywane w wielu procesach przemysłowych. Jednym z nich jest przemysł petrochemiczny, w szczególności dziedzina eksploatacji podwodnych złóż ropy naftowej. W artykule zostało przedstawione zastosowanie tomografu DECART - zaprojektowanego i zbudowanego w Instytucie Informatyki Stosowanej Politechniki Łódzkiej. Pomiary z tomografu zostały powiązane z sygnałami uzyskanymi z systemu pomiaru promieniowania gamma. Wykorzystanie danych uzyskanych z różnych rodzajów czujników umożliwiło pomiar przepływu mieszaniny składającej się z wody morskiej, ropy naftowej i gazu. W pracy przedstawiono podstawy teoretyczne, które stanowiły punkt wyjścia do wykorzystania tomografu multimodalnego jak i wyniki eksperymentów przeprowadzonych na Uniwersytecie w Bergen. Pomiary potwierdziły, że podejście multimodalne umożliwia szybki i niezawodny pomiar udziału faz w przepływie wielofazowym. Zastosowane algorytmy pozwalają na przyspieszenie pomiarów on-line i przedstawienie wyników w formie wymaganej w zastosowaniach przemysłowych. Wnioski z badań mogą być wykorzystane jako wskazówki dla konstrukcji tomografu do praktycznych zastosowań przemysłowych.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 1; 46-49
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma-Ray Spectrometry Laboratory for high-precision measurements of radionuclide concentrations in environmental samples
    Autorzy:
    Jodłowski, P.
    Kalita, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148485.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-ray spectrometry
    environmental samples
    efficiency
    self-absorption
    coincidence summing
    Opis:
    The paper outlines the methodology used in the Gamma-Ray Spectrometry Laboratory for high-precision measurements of radionuclide activity concentrations in environmental samples. The Laboratory equipment includes a semiconductor detector HPGe with a 42% relative efficiency. The detector is placed in a Pb housing made of bricks 10 cm in thickness. Three measurement geometries are considered: Marinelli beakers 710 cm3 in volume and two cylindrical geometries 121 and 48 cm3 in volume. In the efficiency calibration (E = 32 division sign 1836 keV) mixed gamma standard solutions were used. Obtained experimental efficiency values epsilon were fitted with two quadratic functions. The junction point is that equivalent to 200 keV. Uncertainty of the calibration curve is 2% for E > 200 keV. The relationship between the total efficiency and the energy epsilon t(E) was also found for energies E = 33 division sign 1250 keV. Self-absorption correction factors Cs are calculated by the method proposed by K. Debertin, the uncertainty level being 1 division sign 2% for E > 100 keV. These correction factors are calculated by an original computer program. Coincidence summing correction factors Cc for the selected nuclides are derived using the ETNA computer program, basing on the relationships epsilon(E) and epsilon t(E). Minimum detectable activity (MDA) for selected nuclides encountered in environmental samples was determined for the water matrix. The methodology used was successfully verified in the course of international intercomparison measurements.
    Źródło:
    Nukleonika; 2010, 55, 2; 143-148
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bone powder as EPR dosimetry system for electron and gamma radiation
    Autorzy:
    Ziaie, F.
    Hajiloo, N.
    Fathollahi, H.
    Mehtieva, S. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/148156.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bone powder dosimeter
    EPR response
    dose rate
    electron beam
    gamma ray
    Opis:
    In this work bovine bone powder samples were irradiated at three different dose rates of 100, 260 and 630 kGy/min for the absorbed dose range of 3 to 110 kGy, using 10 MeV electron beam radiation. The samples were subjected to EPR measurement at room temperature in air. The variation of EPR signal intensities were constructed and evaluated base on quantitative data related to the absorbed doses. Moreover, they were compared with the obtained results from the samples irradiated by a 60Co gamma-ray source with a dose rate of 2.65 kGy/h. The time and temperature effects on the EPR response of this dosimeter were also studied. The results indicated that the bone sample was a suitable dosimeter especially for electron beam at high doses.
    Źródło:
    Nukleonika; 2009, 54, 4; 267-270
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of anthropogenic radionuclides in post-Fukushima Pacific seawater samples
    Autorzy:
    Lutter, G.
    Tzika, F.
    Hult, M.
    Aoyama, M.
    Hamajima, Y.
    Marissens, G.
    Stroh, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/148313.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    detection limit
    Fukushima
    gamma-ray spectrometry
    Monte Carlo
    radiocesium
    underground laboratory
    Opis:
    Following the accident at the Daiichi Fukushima nuclear power plant in 2011, a vast number of Pacific seawater samples from many locations far from Fukushima have been collected by Japanese investigators. Due to dilution, the activities of radionuclides from North Pacifi c seawater samples are very low, which calls for extraordinary measures when being measured. This study focuses on the metrological aspects of the gamma-ray spectrometry measurements performed on such samples in two underground laboratories; at HADES (by JRC- -IRMM in Belgium), and at Ogoya (by Kanazawa University in Japan). Due to many samples and long measurement times, all available HPGe detectors needed to be employed. In addition to single coaxial detectors, this involved multidetector systems and well detectors. Optimization of detection limits for different radionuclides and detectors was performed using Monte Carlo simulations.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 545-550
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Large Sample Neutron Activation Analysis: correction for neutron and gamma attenuation
    Autorzy:
    Tzika, F.
    Stamatelatos, I.
    Kalef-Ezra, J.
    Bode, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147265.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutron activation analysis
    neutron self-shielding
    gamma-ray attenuation
    MCNP code
    Opis:
    A Large Sample Neutron Activation Analysis (LSNAA) facility is under development at the GRR-1 research reactor, NCSR "Demokritos". The LSNAA facility design incorporates sample irradiation in the reactor graphite thermal neutron column and subsequent measurement of the activity induced in a gamma spectroscopy system with gamma ray transmission measurement options included. The Monte Carlo neutron and photon transport code MCNP-4C was used to model the facility. Appropriate correction factors accounting for neutron field perturbation during sample irradiation and high-purity germanium detector efficiency for the volume source were derived. The results of the computations were experimentally verified by measurements for a set of known materials. The LSNAA facility will be used to perform multi-element, non-destructive, contamination-free analysis of large volume samples with high sensitivity and excellent sampling. End-users of the facility will be archaeological, environmental, bio-medical research laboratories and industry.
    Źródło:
    Nukleonika; 2004, 49, 3; 115-121
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the Radiation Hazards Indices of Organic Fertilizers Using NaI(Tl) Gamma Spectrometer
    Autorzy:
    Baqir, Yassir Atta
    Kadhim, Nada Farhan
    Abdaljalil, Rana O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030492.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Organic fertilizer
    external risk
    gamma ray spectrometer
    radium equivalent
    specific activity
    Opis:
    Recently the use of organic fertilizers is increased to raise the agricultural products and reclaim land for cultivation in the world. These fertilizers contain many natural radionuclides, such as Uranium series (U-238), Thorium series (Th-232), and Potassium (K-40). Organic fertilizers can be considered as one of the natural sources of radiation in the soil. The specific activities of natural radionuclides U-238, Th-232, and K-40 in organic fertilizers were measured using a gamma-ray spectrometer NaI(Tl) detector and Rad Eye-B20 portable detector. Results of NaI(Tl) detector showed that the mean value of activity concentrations of U-238, Th-232, and K-40 was 2.101 Bq/kg, 0.329 Bq/kg, and 95.791 Bq/kg, respectively, were less than the recommended limits. The mean value of radiometric parameters Raeq, Hin, Hex, Iγ, Iɑ, DƔ, and AEDE were also calculated (9.398 Bq/kg, 0.0355, 0.0249, 0.037, 0.0123, 4.959 nGy/h, 0.0065 mSv/y). But the maximum and minimum values of activity concentration were found in sample O.2 and O.4, respectively. The results of Rad Eye-B20 portable detector showed that the maximum (0.415 Bq/cm2, 0.17 µSv/h, and 1.055 Cps) and the minimum (0.255 Bq/cm2, 0.13 µSv/h, and 0.485 Cps) values of surface contamination, Dose Rate, and General Count Rate per second were respectively found in samples O.2 and O.4; all they were slightly higher than background measurements (0.21 Bq/cm2, 0.12 µSv/h, and 0.44 Cps). Measurements of NaI(Tl) detector were matched and confirmed by Rad Eye-B20 detector. All measurements of the radiological hazard to consumers were less than the recommended limits.
    Źródło:
    World Scientific News; 2020, 144; 126-140
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma-ray and magnetic susceptibility correlation across a Frasnian carbonate platform and the search for "punctata" equivalents in stromatoporoid-coral limestone facies of Moravia
    Autorzy:
    Geršl, M.
    Hladil, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058866.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Moravian Karst
    Devonian
    limestones
    stratigraphy
    natural gamma-ray activity
    magnetic susceptibility
    Opis:
    A comparison of the HV-105 Křtiny gamma-ray log (carbonate platform margin and proximal slope, thickness of Frasnian beds ~270 m) with the three times thinner gamma-ray spectrometric section from Mokrá (inner platform, Frasnian ~93.5m) has significantly increased the reliability of stratigraphic correlation between the outer and inner platform areas, i.e. it has allowed strengthening of the detailed links between conodont-bearing and barren sequences. The detailed gamma-ray and magnetic susceptibility patterns also provide promising clues which might help trace the "punctata Zone" stratigraphic equivalents, located far in the interior of the platform stromatoporoid-coral facies.
    Źródło:
    Geological Quarterly; 2004, 48, 3; 283-292
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of an energy-resolving detection system for mammography applications : a preliminary study
    Autorzy:
    Taha, Eslam M.
    Elmoujarkach, Ezzat A.
    Balamesh, Ahmed
    Alzaidi, Samir A.
    Alhawsawi, Abdulsalam M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2171786.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    energy-resolving detection systems
    gamma-ray imaging
    GATE simulation toolkit
    mammography
    Opis:
    Breast cancer remains one of the major causes of mortality among female cancer patients. This fact caused a spark in the medical field, which in turn helped to improve the diagnostic and treatment of breast cancer patients over the years making this field always active with new ideas and innovative methods. In our study, a new method was explored using an energy-resolving detection system made from a NaI (Tl) scintillation detector to detect the gamma photons from an Am-241 radiation source to try and construct an image by scanning the American College of Radiology (ACR) mammography phantom. In addition to the experimental work, a Geant4 Application for Tomographic Emission (GATE) toolkit was used to investigate more complex options to improve the image quality of mammographic systems, which is limited by the experimental setup. From the experimental setup, the researchers were able to construct an image using the 26.3 keV and the 59.5 keV energy photons, to show the largest size tumour (12 mm) in the ACR phantom. With an improved setup in the simulation environment, the majority of the ACR phantom tumours was visible using both energy windows from the 26.3 keV and the 59.5 keV, where the 26.3 keV yielded better quality images showing four tumours compared to three when using 59.5 keV. The simulation results were promising; however, several improvements need to be incorporated into the experimental work so that the system can generate high-resolution mammographic images similar to the ones obtained by the GATE simulation setup.
    Źródło:
    Nukleonika; 2022, 67, 2; 35--40
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluka simulation of PGNAA system for determining heavy metal pollution in the soil sample
    Autorzy:
    Zhang, Can
    Yang, Jianbo
    Li, Rui
    Qiao, Yujie
    Zhang, Xu
    Xu, Jie
    Powiązania:
    https://bibliotekanauki.pl/articles/146960.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    PGNAA
    Fluka
    heavy metal
    prompt gamma-ray yield
    metal ciężki
    szybka wydajność
    promieniowanie gamma
    Opis:
    This study presented a self-designed prompt gamma neutron activation analysis (PGNAA) model and used Fluka simulation to simulate the heavy metals (Mn, Cu, Hg, Ni, Cr, Pb) in soil samples. The relationship between the prompt gamma-ray yield of each heavy metal and soil thickness, content of heavy metals in the soil, and source distance was obtained. Simulation results show that the prompt gamma-ray yield of each heavy metal increases with the increase in soil thickness and reaches saturation at 18 cm. The greater the proportion of heavy metals in the soil, the greater the prompt gamma-ray yield. The highest content is approximately 3%, and the change in distance between the neutron source and soil sample does not affect the prompt gamma-ray yield of heavy metals.
    Źródło:
    Nukleonika; 2020, 65, 1; 13-17
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemical analysis for palaeoenvironmental interpretations : a case study of the English Wealden (Lower Cretaceous, south-east England)
    Autorzy:
    Akinlotan, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060616.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    elemental composition
    X-ray fluorescence
    spectral gamma-ray
    palaeoenvironments
    Lower Cretaceous
    south-east England
    Opis:
    The elemental composition of terrigenous sediments is extremely important for interpreting the depositional conditions of sedimentary basins especially when traditional data are not available or insufficient. For the first time in the published literature, the elemental composition of the Lower Cretaceous Weald Basin (south-east England) is presented via X-ray fluorescence (XRF) and Spectral Gamma-ray (SGR) methods. The concentrations of Zr, Cr, Ni, Rb, and Sr in varying quantities suggest that the sediments may have been sourced from a stable craton while the enriched redox-sensitive elements such as Mo and Co confirm the presence of anoxic and reducing conditions at the sites of deposition. The spectral gamma-ray data show that the sandstone facies are more radioactive than the adjacent mudstone and shale and this trend is consistent with a freshwater origin. The higher quantity of thorium in relation to uranium indicates humid and hot palaeoclimatic conditions at the source areas that favoured intense weathering. The results of these analyses reinforce the importance of the geochemistry of sedimentary rocks as useful tools for understanding the depositional conditions of sedimentary basins.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 227--238
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of archival borehole data to recognizing the primary mineral composition and diagenetic changes in Jurassic sandy rocks of the Polish Basin
    Autorzy:
    Wróblewska, Sara Marlena
    Powiązania:
    https://bibliotekanauki.pl/articles/2201221.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    petrofacies analysis
    Jurassic sandstones
    resistivity log
    gamma ray log
    spontaneous potential log
    Opis:
    With emphasis being placed on the re-examining of mature petroleum basins and reduction of the negative impact of the industry on the environment, the use of archival data in geological exploration is essential. This is especially important in regions where the old, Soviet-type tools were used in the past and which are now using modern, western logging equipment. The application of archival geological, geochemical and geophysical data allows recognition of reservoir formations without the use of modern measurements. For the purpose of this research, Jurassic sandy rocks identified in the archival borehole Z-GN4 were analysed. They appear to be a perfect target for further petroleum and geothermal exploration in the Polish Basin; however, variable mineral composition and diagenetic features can cause difficulties while estimating their reservoir properties. The difference between gamma ray and spontaneous potential shale volume parameter (clay difference) was applied together with gamma ray measurement to determine the impact of primary and diagenetic features on each sandy petrofacies. Based on an integration of detailed petrographic analysis of available core samples from Z-GN4 borehole with archival borehole logs, four different sandy petrofacies were distinguished. Moreover, deep resistivity and sonic logs were used to highlight the carbonate-cemented intervals. This study shows how the application of petrofacies analysis in archival datasets can support the interpretation of uncored intervals and upgrade the level of reservoir characterization.
    Źródło:
    Geological Quarterly; 2022, 66, 3; art. no. 24
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Np-237 incineration study in various beams in ADS setup QUINTA
    Autorzy:
    Kilim, S.
    Strugalska-Gola, E.
    Szuta, M.
    Bielewicz, M.
    Tyutyunnikov, S. I.
    Furman, W. I.
    Adam, J.
    Stegailov, V. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146295.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Np-237
    accelerator-driven system
    ADS
    gamma-ray spectrometry
    fission
    neutron capture
    Opis:
    Neptunium-237 samples were irradiated in a spallation neutron fi eld produced in accelerator-driven system (ADS) setup QUINTA. Five experiments were carried out on the accelerators at the JINR in Dubna – one in carbon (C6+), three in deuteron, and one in a proton beam. The energy in carbon was 24 GeV, in deuteron 2, 4 and 8 GeV, respectively, and 660 MeV in the proton beam. The incineration study method was based on gamma-ray spectrometry. During the analysis of the spectra several fi ssion products and one actinide were identifi ed. Fission product activities yielded the number of fi ssions. The actinide (Np-238), a result of neutron capture by Np-237, yielded the number of captures. The main goal of this work was to fi nd out if and how the incineration rate depended on parameters of the accelerator beam.
    Źródło:
    Nukleonika; 2018, 63, 1; 17-22
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time of soil water thermodynamic equilibrium during retention curve establishment using gamma-ray beam attenuation
    Autorzy:
    Pires, L.
    Bacchi, O.
    Reichardt, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/148674.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-ray attenuation
    time of equilibrium
    pressure chamber
    soil water retention curve
    Opis:
    The soil water retention curve (SWRC) represents a fundamental part of the characterization of the soil hydraulic properties. The establishment of SWRC is usually time-consuming and presents several problems such as the difficulty of a correct judgment of the time of equilibrium. This work presents a new methodology that involves gammaray beam attenuation technique associated with the traditional pressure chambers, having as objective the more precise judgment of the time to attain equilibrium. The gamma-ray source used has an activity of 3.7 GBq consisting of 241Am, with peak energy of 59.54 keV. For the determination of retention curves using the gamma-ray attenuation technique, an acrylic pressure chamber was projected and constructed to be positioned between the source and detector with the gamma-ray beam crossing the center of the chamber and the soil sample during water extraction. The proposed technique allowed, through a specifically elaborated software for data acquisition, to evaluate with precision the exact instant of the equilibrium and, consequently, to obtain the right moment to change the chamber pressure to a new desired level, leading to a reduction of the time required for the whole retention curve determination. The results obtained show that the gamma-ray attenuation technique can be very useful as an auxiliary tool to evaluate SWRC, utilizing the Richards chamber.
    Źródło:
    Nukleonika; 2005, 50, 4; 173-177
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cosmogenic radionuclides in the Sołtmany (L6) meteorite
    Autorzy:
    Laubenstein, M.
    Giampaoli, A.
    Janowski, P.
    Mietelski, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/411508.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    meteorite
    ordinary chondrite
    short-lived radionuclides
    cosmogenic radionuclides
    gamma-ray spectrometry
    52Mn
    Opis:
    Cosmogenic radionuclides were measured in two specimens of the Sołtmany chondrite (L6) that fell on April 30, 2011. The first fragment (154.9 g) was measured 12 days after the fall and the second piece (120 g), 53 days after the fall. Both fragments were measured by means of non-destructive gamma ray spectroscopy. The first specimen was examined with an ultra-low background high purity germanium (HPGe) detector in a deep underground laboratory. A standard low-background HPGe detector was used to examine the second fragment in a ground level laboratory. Twelve cosmogenic nuclides were detected in the activity range of 0.030 m・Bq g–1 until 1.5 m・Bq g–1 Their activities place constraints on the exposure history of the meteorite and reflect the effect of solar modulation of galactic cosmic rays during the solar maximum. On the activities of expected radionuclides 60 Co (< 0.0075 m・Bq g–1) and 44 Ti (< 0.023 m・Bq g–1) only upper limits could be given. Sołtmany is part of a group of only 14 meteorites where 52 Mn (5.591 d half life) could be determined.
    Źródło:
    Meteorites; 2012, 2, No. 1-2; 45-51
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma-ray beam attenuation to assess the influence of soil texture on structure deformation
    Autorzy:
    Pires, L.
    Bacchi, O.
    Dias, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/147480.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-ray attenuation
    soil physical properties
    soil structure deformation
    soil sampling
    soil porosity
    Opis:
    Gamma-ray beam attenuation is a non-invasive technique that permits analysis of soil porosity without disturbing the region of interest of the core sample. The technique has as additional advantage to allow measurements point by point on a millimetric scale in contrast to other methodologies that are invasive and analyze the soil properties in the bulk sample volume. Soil porosity can be used as an important parameter to quantify soil structural damages, which affect soil aeration, water movement and retention. In this study, porosities of three soils different in texture were measured at various positions in order to analyze the impact of the sampling procedure on the structure of each particular soil texture. The gamma-ray attenuation system consisted of an 241Am radioactive source having an activity of 3.7 GBq, collimated with cylindrical lead collimators of 2 mm diameter. The results obtained show the presence of dense regions near the edges of samples and that different soil textures can suffer distinct deformations at sampling.
    Źródło:
    Nukleonika; 2006, 51, 2; 125-129
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metodyka określania koncentracji pierwiastków promieniotwórczych frakcji pylastej wydzielonej z przedkarpackich utworów mioceńskich
    Methodology for defining the concentration of radioactive elements in the silt fraction separated from Carpathian Foredeep Miocene formations
    Autorzy:
    Skupio, Rafał
    Łykowska, Grażyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1834054.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Nafty i Gazu - Państwowy Instytut Badawczy
    Tematy:
    silt
    promieniowanie gamma
    miocen
    naturalna promieniotwórczość skał
    radiometria
    gamma ray
    Miocene
    natural radioactivity in rocks
    radiometry
    Opis:
    The research was performed on seven samples of Miocene rocks collected from the core. The selected material was represented by sandstones, mudstones and claystones. The main goal of the work was to separate the silt fraction and to determine its impact on the level of radioactivity of the Miocene rocks of the Carpathian Foredeep. In this study, the silt fraction separation method developed in the Well Logging Department of INiG – PIB was used. Wentworth classification was used to determine the size of the silt, assuming its range from 4 to 63 µm. The selected rock material was prepared in several stages using the methods of freezing, sieving, centrifugation and sedimentation. Additional tests, including mineralogical XRD, chemical XRF and matrix density measurements were performed to determine the rock types and their properties. A number of radiometric tests were performed to determine the content of natural radioactive elements. The analyses were carried out on a small number of tests because of their long preparation and limited material availability. Reliable determination of the parameters of individual grain fractions required verification and improvement of the applied research methods. Radiometric measurements determining the natural content of potassium 40K, uranium 238U and thorium 232Th were carried out in the RT-50 equipped with a three-inch NaI(Tl) crystal. In the first place, standard analyses were conducted for dried and crushed samples of Miocene claystones, mudstones and sandstones. Further measurements were made on the separated silt fraction and in the case of one sample, also on the remaining fractions (clay and sand). In this case, the analyses were carried out repeatedly using a new procedure enabling the determination of radioactive elements in low-mass samples. The results of the work allowed approximate determination of the natural gamma radioactivity of the silt. An important conclusion is that, silt is no more radioactive than the other components of the rock. This paper also attempted the estimation of the impact of heavy mineral content on the natural radioactivity of the Miocene rocks. For tests purpose, minerals with a density above 2.85 g/cm3 were separated from the rock samples and a series of analyses were carried out once again. The obtained results were minimally understated but close enough to the samples before separation. It can be concluded that the heavy minerals in the tested samples do not affect the total radioactivity of the rocks in the research area.
    Źródło:
    Nafta-Gaz; 2020, 76, 10; 679-687
    0867-8871
    Pojawia się w:
    Nafta-Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design, construction and performance of a pressure chamber for water retention curve determination through traditional and nuclear methods
    Autorzy:
    Pires, L.
    Bacchi, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/146181.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    soil water potential
    gamma-ray attenuation
    soil water content
    soil physics
    radioisotope application
    Opis:
    We present in this work a detailed design of a small low-pressure chamber outfitted with a ceramic porous plate for evaluating the soil water retention curve (SWRC) in the water potential range from 0 to -100 kPa. The chamber is made of acrylic and permits the use of one unique soil sample each time. The use of this chamber allows quick measurements of soil moisture using nuclear (based on gamma-ray attenuation) and conventional methods and SWRC determinations made with the designed chamber are in agreement with those obtained using a commercial low-pressure chamber. The chamber was designed especially for testing the use of the nuclear method as an auxiliary tool for SWRC determinations but it can be easily adapted for routine investigations and a practical alternative for the conventional SWRC method.
    Źródło:
    Nukleonika; 2006, 51, 4; 225-230
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of primary composition and diagenetic mineralization on natural gamma-ray and density logs of Carboniferous sandstones of the Dęblin Formation
    Autorzy:
    Wróblewska, Sara
    Kozłowska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2058639.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    petrofacies analysis
    gamma-ray log
    density log
    diagenetic mineralization
    Dęblin Formation
    Lublin Basin
    Opis:
    The Carboniferous sandstone of the Dęblin Formation is one of the targets for the petroleum industry in the Lublin Basin in southeastern Poland. The formation's primary and diagenetic composition makes it difficult to estimate its reservoir properties. Based on a detailed analysis of core and petrographic samples, normalization of gamma-ray and density logs was made with respect to the grain-framework of the rock. Recounted logs were used for distinguishing 4 different sandstone petrofacies. For these petrofacies, ranges of gamma-ray and bulk density values were determined and the impact of primary and diagenetic mineral composition was estimated. The application of this petrofacies method can upgrade the level of reservoir characterization and support the interpretation of uncored intervals.
    Źródło:
    Geological Quarterly; 2019, 63, 4; 741--756
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Designing a simple radiometric system to predict void fraction percentage independent of flow pattern using radial basis function
    Autorzy:
    Roshani, G. H.
    Nazemi, E.
    Shama, F.
    Imani, M. A.
    Mohammadi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/221419.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-phase flow
    gamma-ray attenuation
    scintillation detector
    void fraction
    artificial neural network
    Opis:
    The void fraction is one of the most important parameters characterizing a multiphase flow. The prediction of the performance of any system operating with more than single phase relies on our knowledge and ability to measure the void fraction. In this work, a validated simulation study was performed in order to predict the void fraction independent of the flow pattern in gas-liquid two-phase flows using a gamma ray 60Co source and just one scintillation detector with the help of an artificial neural network (ANN) model of radial basis function (RBF). Three used inputs of ANN include a registered count under Compton continuum and counts under full energy peaks of 1173 and 1333 keV. The output is a void fraction percentage. Applying this methodology, the percentage of void fraction independent of the flow pattern of a gas-liquid two-phase flow was estimated with a mean relative error less than 1.17%. Although the error obtained in this study is almost close to those obtained in other similar works, only one detector was used, while in the previous studies at least two detectors were employed. Advantages of using fewer detectors are: cost reduction and system simplification.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 2; 347-358
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena typu zailenia w skałach piaskowcowo-ilastych na podstawie danych geofizyki otworowej - metoda wykresów krzyżowych
    Evaluation of shale distribution in shaly-sand rocks on the basis of well logging data - the crossplots method
    Autorzy:
    Bała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/183775.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    zailenie
    porowatość
    profilowania geofizyki otworowej
    profilowanie gamma
    wykresy krzyżowe
    shaliness
    porosity
    well logging data
    gamma ray
    crossplots
    Opis:
    W pracy przeanalizowano wpływ obecności frakcji ilastej na rejestrowane w otworach wartości profilowań geofizyki otworowej. Wykorzystując koncepcję przedstawioną po raz pierwszy przez Thomasa & Stiebera (1975), przeprowadzono obliczenia "odpowiedzi" sond w założonym modelu piaskowcowo-ilastym o zróżnicowanych miąższościach. Porównano wyniki modelowań z rzeczywistymi krzywymi, zarejestrowanymi w otworze J4 w interwale występowania utworów miocenu autochtonicznego. Wykonane wykresy krzyżowe na podstawie pomiarów sondą neutronową i gamma, gęstościową i akustyczną potwierdzają możliwość określenia zarówno typu zailenia, jak i poprawnej porowatości oraz udziału frakcji piaskowcowej (tzw. net to gross) w warstwach złożowych. Wykres krzyżowy oparty na pomiarach gamma i oporności pozwala na rozdzielenie warstw nasyconych wodą i gazem.
    The analysis of effects of shale distribution and clay volume in reservoir formations on well logging curves is presented in this paper. A conception given originally by Thomas & Stieber (1975) was applied into modelling the response of well logging tools for an assumed shaly-sand model. Results of calculations were compared with logs registered in the J4 well which drilled the autochthonous Miocene deposits. Different crossplots obtained based on Gamma Ray and Neutron and Density or Acoustic logs prove that there is a possibility to determine porosity, shale distribution and sand volume (net to gross) in the reservoir horizons.
    Źródło:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2010, 36, 2; 223-239
    0138-0974
    Pojawia się w:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma-ray computed tomography as a tool to evaluate porosity changes along depth for surface crusted soils
    Autorzy:
    Pires, L. F.
    Bacchi, O. O. S.
    Reichardt, K.
    Dias, N. M. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146838.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-ray attenuation
    soil density
    soil structure
    soil surface sealing
    241 Am
    applied nuclear physics
    gamma tomography
    Opis:
    Assessment of changes in porosity (ö) along depth for soils with surface crusting is difficult because conventional soil physical investigation tools are destructive and usually require a long period of time for preparation and analysis of the samples. Computed tomography (CT) has frequently been used as a method to evaluate soil structure in a nondestructive, sensitive, and rapid manner. CT data can be used for measuring at a millimetric scale changes in ö along depth for soils with surface crusting. The main objective of this work was to investigate the sensibility of the gamma-ray CT to assess soil structural changes along depth in samples presenting structural crust. CT images were taken with a first generation scanner of 1.14 mm resolution along eight different soil layers within the 0 28 mm depth. Porosity increased along depth up to the 14 17.5 mm layer. Through the analysis of the ö distribution of each layer it was possible to show that the sealed surface layer presented ö values of approximately 30%, while the other layers were greater than 30% up to 60% (macropore regions). The sealing crust thickness was estimated to be in the range of 2.3 3.5 mm.
    Źródło:
    Nukleonika; 2007, 52, 3; 125-131
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spektrometryczne profilowanie gamma w odsłonięciach geologicznych : metody i przykłady zastosowania
    Handheld gamma-ray spectrometry at geological exposures : methods and applications
    Autorzy:
    Moskalewicz, Damian
    Powiązania:
    https://bibliotekanauki.pl/articles/20199952.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ręczna spektrometria
    promieniowanie gamma
    radionuklidy
    promieniotwórczość naturalna
    geofizyka
    Bornholm
    handheld gamma-ray spectrometry
    radionuclides
    natural radioactivity
    geophysics
    Opis:
    Handheld gamma-ray spectrometry (hGRS) is a valuable method for geological studies. It may be applied in correlations between well-logging and outcrop strata, enhance interpretations of sedimentological data, prospect radiogenic ores and geothermal resources, and identify radiogenic hazards for society. This paper aims to review and popularize one of the research methods based on a mobile device (hGRS) equipped with a BGO (bismuth germanium oxide) scintillator. The general concept of the research method is presented in this paper. The method's perspectives and limits based on reviewed literature. Advantages of hGRS include, e.g., low cost, short data acquisition time, the possibility of studying natural exposures, and a broad set of research applications. The main disadvantages comprise relatively modest resolution of acquired data and their difficult interpretation in complex geological formations. The review is backed by sample measurements performed in various geological exposures at Bornholm Island (Baltic Sea). Measurements comprised igneous rocks exposed in several quarries and sedimentary profiles near Liesti Valley and Muleby.
    Źródło:
    Przegląd Geologiczny; 2022, 70, 11; 806-815
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of liquid-gas flow in pipeline using gamma-ray absorption technique and advanced signal processing
    Autorzy:
    Hanus, Robert
    Zych, Marcin
    Mosorov, Volodymyr
    Golijanek-Jędrzejczyk, Anna
    Jaszczur, Marek
    Andruszkiewicz, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1848957.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-phase flow
    void fraction
    gamma-ray absorption
    flow regime identification
    artificial neural network
    Opis:
    Liquid-gas flows in pipelines appear in many industrial processes, e.g. in the nuclear, mining, and oil industry. The gamma-absorption technique is one of the methods that can be successfully applied to study such flows. This paper presents the use of the gamma-absorption method to determine the water-air flow parameters in a horizontal pipeline. Three flow types were studied in this work: plug, transitional plug-bubble, and bubble one. In the research, a radiometric set consisting of two Am-241 sources and two NaI(TI) scintillation detectors have been applied. Based on the analysis of the signals from both scintillation detectors, the gas phase velocity was calculated using the cross-correlation method (CCM). The signal from one detector was used to determine the void fraction and to recognise the flow regime. In the latter case, a Multi-Layer Perceptron-type artificial neural network (ANN) was applied. To reduce the number of signal features, the principal component analysis (PCA) was used. The expanded uncertainties of gas velocity and void fraction obtained for the flow types studied in this paper did not exceed 4.3% and 7.4% respectively. All three types of analyzed flows were recognised with 100% accuracy. Results of the experiments confirm the usefulness of the gamma-ray absorption method in combination with radiometric signal analysis by CCM and ANN with PCA for comprehensive analysis of liquid-gas flow in the pipeline.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 1; 145-159
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obliczanie ciepła radiogenicznego osadów cechsztynu i karbonu na podstawie danych geofizyki otworowej w rejonie rafy Brońsko
    Radiogenic heat of Zechstein and Carboniferous rocks calculated using well-logging data from the Brońsko Reef area
    Autorzy:
    Bała, M.
    Waliczek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074929.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ciepło radiogeniczne
    widmowe promieniowanie gamma
    geofizyka otworowa
    skały macierzyste
    radiogenic heat
    spectral gamma ray
    well logging
    source rocks
    Opis:
    Rocks characterized by an increased kerogene transformation ratio, which is an important indicator of hydrocarbon generation in petroleum exploration, generate more radiogenic heat as well. The goal of this paper was to evaluate radiogenic heat (A) in several boreholes drilled through Zechstein and Carboniferous deposits of the Brońsko Reef. Based on spectral gamma ray and Litho-Density Logs measurements, the quantitative concentration of radioactive elements including uranium, thorium and radioactive isotope of potassium (40K) was evaluated. These data along with bulk density were subsequently used to calculate the radioactive heat. The calculations were performed for boreholes B-2, B-3, B-4 and B-8, located in central part of the reef. Increased values of A appeared characteristic for the Main Dolomite, Zechstein limestone and Carboniferous deposits with high share of shales.
    Źródło:
    Przegląd Geologiczny; 2012, 60, 3; 155-163
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Void fraction and flow regime determination by means of MCNP code and neural network
    Autorzy:
    Rabiei, A.
    Shamsaei, M.
    Kafaee, M.
    Shafaei, M.
    Mahdavi, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/146656.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    flow regime
    gamma-ray densitometry
    neural network (NN)
    Monte Carlo N-particle (MCNP)
    void fraction
    Opis:
    One of the non-intrusive and accurate methods of measuring void fraction in two-phase gas liquid pipe flows is the use of the gamma-transmission void fraction measurement technique. The goal of this study is to describe low-energy gamma-ray densitometry using an 241Am source for the determination of void fraction and flow regime in water/gas pipes. The MCNP code was utilized to simulate electron and photon transport through materials with various geometries. Then, a neural network was used to convert multi-beam gamma-ray spectra into a classification of the flow regime and void fraction. The simulations cover the full range of void fraction with Bubbly, Annular and Droplet flows. By using simulation data as input to the neural networks, the void fraction was determined with an error less than 3% regardless of the flow regime. It has thus been shown that multi-beam gamma-ray densitometers with a detector response examined by neural networks can analyze a two-phase flow with high accuracy.
    Źródło:
    Nukleonika; 2012, 57, 3; 345-349
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of thermal neutron detection capability of a CdZnTe detector in a mixed gamma-neutron radiation field
    Autorzy:
    Yücel, H.
    Narttürk, R. B.
    Zümrüt, S.
    Gedik, G.
    Karadag, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146914.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutron detection
    CdZnTe
    prompt gamma ray
    thermal neutron
    cadmium
    neutron sensitivity
    241Am-Be source
    Opis:
    The aim of this study was to investigate the thermal neutron measurement capability of a CdZnTe detector irradiated in a mixed gamma-neutron radiation fi eld. A CdZnTe detector was irradiated in one of the irradiation tubes of a 241Am-Be source unit to determine the sensitivity factors of the detector in terms of peak count rate (counts per second [cps]) per neutron flux (in square centimeters per second) [cps/neutron•cm–2•s–1]. The CdZnTe detector was covered in a 1-mm-thick cadmium (Cd) cylindrical box to completely absorb incoming thermal neutrons via 113Cd(n,γ) capture reactions. To achieve, this Cd-covered CdZnTe detector was placed in a well-thermalized neutron fi eld (f-ratio = 50.9 ± 1.3) in the irradiation tube of the 241Am-Be neutron source. The gamma-ray spectra were acquired, and the most intense gamma-ray peak at 558 keV (0.74 γ/n) was evaluated to estimate the thermal neutron fl ux. The epithermal component was also estimated from the bare CdZnTe detector irradiation because the epithermal neutron cutoff energy is about 0.55 eV at the 1-mm-thick Cd filter. A high-density polyethylene moderating cylinder box can also be fi tted into the Cd fi lter box to enhance thermal sensitivity because of moderation of the epithermal neutron component. Neutron detection sensitivity was determined from the measured count rates from the 558 keV photopeak, using the measured neutron fluxes at different irradiation positions. The results indicate that the CdZnTe detector can serve as a neutron detector in mixed gamma-neutron radiation fields, such as reactors, neutron generators, linear accelerators, and isotopic neutron sources. New thermal neutron filters, such as Gd and Tb foils, can be tested instead of the Cd filter due to its serious gamma-shielding effect.
    Źródło:
    Nukleonika; 2018, 63, 3; 59-64
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mutational changes in Delphinium malabaricum (Huth.) Munz.: a potential ornamental plant
    Autorzy:
    Kolar, F.R.
    Ghatge, S.R.
    Nimbalkar, M.S.
    Dixit, G.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1998.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    Delphinium malabaricum
    ornamental plant
    mutational change
    ethyl methanesulphonate
    sodium azide
    physical mutagen
    gamma-ray
    mutation frequency
    Źródło:
    Journal of Horticultural Research; 2015, 23, 2
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mutagenic effect of gamma rays and EMS on seed germination, seedling height reduction and survivability of chick pea (Cicer arietinum L.) var. Co - 4
    Autorzy:
    Umavathi, S.
    Mullainathan, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/11212.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    mutagenic effect
    gamma-ray
    ethyl methanesulphonate
    seed germination
    seedling height
    reduction
    survivability
    chick-pea
    Cicer arietinum
    germination
    Opis:
    The effect of gamma irradiation and EMS treatment on seed germination and seedling height of Chick pea (Cicer arietinum. L.). In this regard Co-4 variety of chick pea was subjected to different doses/concentrations of gamma rays (20, 30, 40, 50, and 60 kR) and EMS (10, 20, 30, 40 and 50 mM) for inducing mutation. The effect of mutagen was observed on the basis of percentage of seed germination, seedling height reduction at 15th day and survivability. From the result it was observed that, the percentage of seed germination, seedling height reduction at 15th day and survivability were significantly decreased with increasing doses/concentrations of mutagen. The effective doses/ concentrations which caused 50 % growth reduction were 40kR in gamma rays and 30 mM in EMS.
    Źródło:
    International Letters of Natural Sciences; 2014, 11, 1
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    214Bi/214Pb radioactivity ratio three-year monitoring in rainwater in Prague
    Autorzy:
    Ambrosino, Fabrizio
    Thinová, Lenka
    Hýža, Miroslav
    Sabbarese, Carlo
    Powiązania:
    https://bibliotekanauki.pl/articles/148739.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    214Bi/214Pb gamma-ray ratio
    ambient dose equivalent rate
    hybrid method
    rainfall
    time-series analysis
    Opis:
    Continuous monitoring of natural gamma radiation in air has been carried out, during December 2014 – January 2018, with 1-min cyclic measurement in Prague, Czech Republic using a NaI(Tl) probe. The 214Bi/214Pb ratio as a tracer in rainwater has been investigated to study its variations related to both the ambient dose equivalent rate per hour and the amount of rainfall. A hybrid methodology for time series analysis, composed of the aggregation of two signal decomposition methods (multiple linear regression and empirical mode decomposition) and one forecasting method (support vector regression), has been applied to identify the anomalies in the studied signals in order to better find correlations among them. The results show a strong correlation between the ambient dose equivalent rate and the 214Bi/214Pb ratio values and between both these signals and rainfall amount≥5 mm/h. Furthermore, the considered descendants of radon are mainly responsible for the overall ambient dose equivalent rate.
    Źródło:
    Nukleonika; 2020, 65, 2; 115-119
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of magnetic field with chemomutagen and gamma rays on the variability of yielding parameters in barley [Hordeum vulgare L.]
    Autorzy:
    Rybinski, W.
    Pietruszewski, S.
    Kornarzynski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/24954.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    variability
    magnetic field
    chemomutagen
    barley
    mutagen
    spring barley
    biostimulation
    gamma-ray
    Hordeum vulgare
    biological injury
    yielding parameter
    Źródło:
    International Agrophysics; 2003, 17, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie ciepła radiogenicznego utworów syluru i ordowiku basenu bałtyckiego na podstawie danych geofizyki otworowej i jego relacja z materią organiczną
    Study of radiogenic heat of the Baltic Basin Silurian and Ordovician formations on the basis of well logging data and its relationship to organic matter
    Autorzy:
    Bała, Maria
    Wawrzyniak-Guz, Kamila
    Powiązania:
    https://bibliotekanauki.pl/articles/1835090.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Nafty i Gazu - Państwowy Instytut Badawczy
    Tematy:
    ciepło radiogeniczne
    spektrometryczne profilowanie gamma i gamma-gamma
    basen bałtycki
    geofizyka otworowa
    skały macierzyste
    łupki gazonośne
    radiogenic heat
    spectral gamma ray and gamma-gamma logs
    Baltic Basin
    well logging
    source rocks
    gas shale
    Opis:
    W artykule przedstawiono wyniki obliczeń ciepła radiogenicznego (A) wykonanych dla utworów syluru i ordowiku w otworach wiertniczych L-1, K-1, O-2, B-1 i W-1 położonych w basenie bałtyckim. Wykorzystano w tym celu pomiary geofizyki otworowej – spektrometryczne profilowanie gamma (naturalnej promieniotwórczości) oraz pomiary gamma-gamma (profilowanie gęstości objętościowej). Bardzo wysokimi wartościami ciepła radiogenicznego charakteryzowały się osady sylurskich iłowców bitumicznych ogniwa z Jantaru oraz ordowickie ilasto-mułowcowe utwory formacji z Sasina. Są to utwory uznawane za potencjalne sweet spoty z uwagi na podwyższoną zawartość materii organicznej. W obu jednostkach litostratygraficznych zaobserwowano podwyższoną naturalną promieniotwórczość oraz wyraźnie obniżoną gęstość objętościową wywołane obecnością kerogenu. Połączona analiza spektrometrycznego profilowania gamma i profilowania gęstości wykazała, że za wyższą produkcję ciepła radiogenicznego w tych jednostkach odpowiedzialna jest przede wszystkim podwyższona koncentracja uranu. Anomalnie wysokie wartości ciepła radiogenicznego zaznaczały się również w ordowickich iłowcach glaukonitowych formacji ze Słuchowa, w których stwierdzono wyraźny wzrost koncentracji potasu, toru i uranu. Należy zaznaczyć, że utwory czarnych łupków bitumicznych z Jantaru oraz iłowce i mułowce z Sasina charakteryzowały się dużą zmiennością obliczonego parametru A. W prezentowanej pracy przeanalizowano także relacje między obliczonymi wartościami ciepła radiogenicznego a: całkowitym natężeniem promieniowania gamma z pomiaru spektrometrycznego, prędkościami fal podłużnych oraz gęstością objętościową. Zależności określono dla poszczególnych jednostek litostratygraficznych syluru i ordowiku. Podobne relacje ciepła radiogenicznego z profilowaniem gamma zaobserwowano we wszystkich analizowanych otworach z wyjątkiem otworu L-1, w którym sylurskie i ordowickie formacje bogate w kerogen wykazały inną charakterystykę. Zauważono również wyraźne obniżanie się ciepła radiogenicznego ze wzrostem prędkości fal podłużnych. Szczegółowa analiza danych wykazała silne relacje między prędkością a zawartością toru i potasu, które są wskaźnikami minerałów ilastych, oraz zawartością uranu, związanego z obecnością substancji organicznej. Podobny związek pokazujący tendencję obniżania się ciepła radiogenicznego zaobserwowano dla wzrastających wartości gęstości objętościowej analizowanych utworów.
    The paper presents results of computations of the radioactive heat production (A) for the Silurian and Ordovician rocks in the L-1, K-1, O-2, B-1, and W-1 wells located in the Baltic Basin. For this purpose, well logging data – spectral gamma (intensity of the natural radioactivity) and gamma-gamma (bulk density) logs were used. Silurian deposits of the Jantar Bituminous Black Claystone Member and Ordovician deposits of the Sasino Claystone Formation were characterised by very high values of the radiogenic heat. These units are considered as sweet spots due to a high concentration of organic matter. Increased natural radioactivity and significantly reduced bulk densities caused by the presence of kerogen were observed in both lithostratigraphic units. A joint analysis of the spectral gamma ray log and the density logs showed that the increased radiogenic heat production in these formations was mainly caused by a higher concentration of uranium. Abnormally high values of radiogenic heat were also observed in the Ordovician glauconitic claystones of the Słuchowo Formation, where an increase in potassium, thorium, and uranium concentrations was detected. It should be noted that the deposits of the black claystones of the Jantar Member, and the claystones and mudstones of the Sasino Formations were characterised by high variability of the calculated parameter A. The presented article investigated the relationship between the calculated values of radiogenic heat and natural radioactivity, the velocity of longitudinal waves, as well as between bulk density. The relations were determined for the Silurian and Ordovician deposits. Similar relations between the radiogenic heat and the gamma ray log were observed in all wells except the L-1 well, in which Silurian and Ordovician formations rich in kerogen revealed a different characteristic. A significant decrease in radiogenic heat values was observed with the increase in P wave velocity. Detailed data analyses showed strong relationships between velocity and the content of thorium and potassium, which are the indicators of clay minerals, but also the content of uranium, which is associated with the organic matter presence. A similar relation showing a tendency of decreasing radiogenic heat was obtained for increased bulk densities of the formations.
    Źródło:
    Nafta-Gaz; 2019, 75, 9; 515-526
    0867-8871
    Pojawia się w:
    Nafta-Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radioactivity of some building and raw materials used in Croatia
    Autorzy:
    Sofilić, T.
    Barišić, D.
    Sofilić, U.
    Đuroković, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778819.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    radioaktywność
    materiały budowlane
    popiół lotny
    spektometr promieniowania gamma
    skuteczna dawka roczna
    radioactivity
    building materials
    fly ash
    Gamma-ray spectrometer
    annual effective dose
    Opis:
    In the present study, the activity concentrations of 226Ra, 232Th, 40K in some building and raw materials used in Croatia were measured by using a gamma-ray spectrometer with the HPGe detector. The average activity concentrations of the studied different building and raw materials ranged from 11.6 š 1.7 (concrete) to 251.2 š 25.7 Bqkg-1 (GBFS), 14.0 š 2.7 (concrete) to 54.4 š 8.3 (coal fly ash) and 147.2 š 19.0 (concrete) to 773.7 š 82.0 Bqkg-1 (tuff) for 226Ra, 232Th and 40K, respectively. Radium equivalent activity, activity concentration index, absorbed gamma dose rate indoor due to the external exposure and corresponding annual effective dose were determined to estimate the exposure risk arising due to the use of these building and raw materials.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 3; 23-27
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regressive-transgressive cyclothem with facies record of the re-flooding window in the Late Silurian carbonate succession (Podolia, Ukraine)
    Autorzy:
    Łuczyński, P.
    Kozłowski, W.
    Skompski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/138684.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    re-flooding window
    spectral gamma ray record
    shallow water carbonates
    late Silurian
    Podolia
    wody płytkie
    węglan
    sylur
    Podole
    Opis:
    The term “re-flooding window” was recently proposed as a time-interval connected with the transgressive stage of present day peri-reefal development. In the analysis presented here, a fossil record of a re-flooding window has been recognized. Nine Late Silurian carbonate sections exposed on the banks of the Dnister River in Podolia (Ukraine) have been correlated base on bed-by-bed microfacies analysis and spectral gamma ray (SGR) measurements. Correlated were sections representing settings ranging from the inner part of a shallow-water carbonate platform to its slope, through an organic buildup. The reconstructed depositional scenario has been divided into six development stages, with the first three representing a regressive interval and the latter three a transgressive interval of the basin’s history. The re-flooding window has been identified at the beginning of a transgressive part of the succession. Surprisingly, it is characterized by an extremely fast growth of a shallow, tide-dominated platform and by deposition of calciturbiditic layers in a more basinal area. The interpreted succession is a small-scale model illustrating the reaction of carbonate depositional sub-environments to sea level changes and determining the facies position of the stromatoporoid buildups within the facies pattern on a Silurian shelf. The use of SGR analyses in shallow water, partly high-energy, carbonate facies, both for correlation purposes and for identifying depositional systems, is a relatively new method, and thus can serve as a reference for other studies of similar facies assortment.
    Źródło:
    Acta Geologica Polonica; 2015, 65, 3; 297-318
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania nieniszczące - weryfikacja materiałów jądrowych
    Non destructive Analysis – verification of Nuclear Materials
    Autorzy:
    Rzymkowski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/214674.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    badania nieniszczące
    pomiar promieniowania gamma
    analizator wielokanałowy
    wypalone paliwo
    system zabezpieczeń MAEA
    non destructive analysis
    gamma ray measurement
    multichannel analyser
    irradiated fuel
    IAEA safeguards
    Opis:
    W opracowaniu przedstawiono systemy pomiarowe stosowane do weryfikacji materiałów jądrowych w systemie zabezpieczeń.
    The study presents measuring systems used for verification of nuclear materials in the Safeguards.
    Źródło:
    Postępy Techniki Jądrowej; 2020, 1; 21-30
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określanie składu chemicznego i mineralnego skał z wykorzystaniem przenośnego spektrometru XRF pracującego w atmosferze helu
    Determination of the chemical and mineral composition of rocks with the use of a portable XRF spectrometer operating in a helium atmosphere
    Autorzy:
    Skupio, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/2145346.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Nafty i Gazu - Państwowy Instytut Badawczy
    Tematy:
    spektrometria XRF
    litologia
    skład chemiczny
    skład mineralny
    spektrometria gamma
    analiza rdzeni wiertniczych
    XRF spectrometry
    lithology
    chemical composition
    mineral composition
    spectral gamma-ray measurements
    core analyse
    Opis:
    W pracy przedstawiono możliwości prowadzenia pomiarów chemicznych z zastosowaniem przenośnego spektrometru fluorescencji rentgenowskiej z dyspersją energii EDXRF w atmosferze helu. Metodyka badawcza wraz z tworzeniem modeli i interpretacją danych powstała w oparciu o zastosowanie aparatu XRF firmy Bruker, model Tracer 5g. Prowadzenie pomiarów w atmosferze helu umożliwia obniżenie progów detekcji dla pierwiastków lekkich, w tym określanie udziałów sodu (Na) i magnezu (Mg) oraz pierwiastków wchodzących w zakres spektrometrycznego profilowania gamma: potasu (K), uranu (U) i toru (Th). Jednym z elementów nowej procedury pomiarowej jest przygotowanie preparatów w formie pastylek, przy użyciu prasy hydraulicznej o sile nacisku do 25 ton. Pomiary w atmosferze helu mogą być wykonywane jedynie na materiale skonsolidowanym (lita skała, rdzeń wiertniczy lub twarda pastylka). Materiał do badań został pobrany z rdzeni wiertniczych, następnie skwartowany i rozdzielony na poszczególne analizy. Wyniki analiz XRF uzyskane metodą, w której zastosowano przepływ helu, porównano z wynikami pomiarów wykonanych standardową aparaturą XRF, chemicznych badań laboratoryjnych, analiz składu mineralnego XRD oraz badań naturalnej promieniotwórczości gamma. Analizy XRF bez możliwości prowadzenia pomiarów w atmosferze helu wykonane zostały aparatem Titan S1 (firmy Bruker). Badania przeprowadzono na próbkach skał pochodzących z dwóch otworów wiertniczych – P4 (19 próbek) i J1 (11 próbek). W przypadku P4 dysponowano dokładnymi pomiarami laboratoryjnymi ICP-MS (ang. Inductively Coupled Plasma Mass Spectrometry), ICP-OES (ang. Inductively Coupled Plasma Mass Spectrometry) oraz wynikami XRD, natomiast w J1 – wynikami badań radiometrycznych i mineralnych. W próbkach z otworu J1 występowały skalenie oraz dolomit, co umożliwiło przetestowanie budowy modeli uwzględniających te minerały w odniesieniu do wyznaczenia udziałów sodu i magnezu. W końcowej części pracy przedstawiono wykresy korelacyjne dla wybranych, najważniejszych pierwiastków budujących matrycę skalną, modele mineralno–chemiczne zbudowane na ich podstawie oraz wykresy korelacyjne dla spektrometrycznych pomiarów gamma.
    In the paper, author presented the possibility of conducting chemical measurements in a helium atmosphere using a portable Energy Dispersive X-Ray Fluorescence spectrometer (EDXRF). The methodology, model creation and data interpretation were based on the Tracer 5g XRF (Bruker) application. Measurements in a helium atmosphere enable the reduction of detection limits for light elements, including the determination of sodium (Na) and magnesium (Mg), as well as elements applied in the spectral gamma-ray profiling range: potassium (K), uranium (U) and thorium (Th). One of the new measurement procedure aspects is the preparation of pellets using a hydraulic press with a pressure of up to 25 tons. Measurements with helium flow can only be performed on a consolidated material (solid rock, drill core, or pellet). The material for the research was taken from the cores, then quartered and divided into individual analyses. The results of the XRF analyses obtained with the helium flow method were compared to measurements made with standard XRF equipment, chemical laboratory tests, the results of XRD mineral analyses, and tests of natural gamma radioactivity. XRF analyses without the possibility of conducting measurements in a helium atmosphere were performed with the Titan S1 apparatus (Bruker). The tests were carried out on rock samples from two boreholes, P4 (19 samples) and J1 (11 samples). In P4, precise laboratory measurements ICP-MS (Inductively Coupled Plasma Mass Spectrometry), ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry) and XRD results were available, while in the J1, radiometric and mineral tests were performed. Feldspars and dolomites were present in the samples from the J1 borehole, which made it possible to test the construction of models incorporating these minerals in relation to sodium and magnesium. The final part of the work presents correlation diagrams for selected, most essential elements forming the rock matrix, mineral and chemical models built on their basis and correlation diagrams for gamma spectrometric measurements.
    Źródło:
    Nafta-Gaz; 2021, 77, 4; 227-234
    0867-8871
    Pojawia się w:
    Nafta-Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania niszczące i wspomaganie weryfikacji materiałów jądrowych
    Destructive analysis and supporting systems for verification of nuclea materials
    Autorzy:
    Rzymkowski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2200638.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    badania niszczące
    promieniowanie gamma
    analizator wielokanałowy
    wypalone paliwo
    system zabezpieczeń MAEA
    systemy monitorujące
    destructive analysis
    gamma ray
    multichannel analyser
    spent nuclear fuel
    IAEA safeguards
    monitoring systems
    Opis:
    W opracowaniu przedstawiono systemy pomiarowe i wspomagające stosowane do weryfikacji materiałów jądrowych w systemie Zabezpieczeń. Opisano metody pobierania próbek do badań niszczących oraz metody ich analizy. Omówiono systemy wspomagające obserwacyjno-rejestrujące i systemy zamykania – plombowania.
    The study presents the measurement and support systems used for verifcation nuclear materials in the Safeguards system. Methods of sampling for destructive testing and methods of their analysis are described. Supporting systems monitoring and surveillance as well as sealing systems are discussed.
    Źródło:
    Postępy Techniki Jądrowej; 2023, 1; 25--32
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Niskotłowy cyfrowy spektrometr promieniowania gamma
    Low-level, digital gamma-rays spectrometer
    Autorzy:
    Gorzkiewicz, Krzysztof
    Mietelski, Jerzy Wojciech
    Kierepko, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/985834.pdf
    Data publikacji:
    2020
    Wydawca:
    Indygo Zahir Media
    Tematy:
    niskotłowa cyfrowa spektrometria
    promieniowania gamma
    detektor BEGe
    scyntylatory plastikowe
    system aktywnej osłony antymionowej
    low-level digital gamma-ray spectrometry
    BEGe detector
    plastic scintillators
    cosmic muons veto system
    Opis:
    W artykule przedstawiono konstrukcję niskotłowego cyfrowego spektrometru promieniowania gamma wyposażonego w detektor germanowy BEGe (Broad Energy Germanium), wielowarstwową osłonę bierną oraz pięć detektorów scyntylacyjnych pełniących rolę dodatkowej, aktywnej osłony spektrometru. Akwizycja danych odbywa się za pomocą cyfrowego analizatora (digitizera) CAEN DT5725, natomiast ich analiza wykonywana jest przy użyciu autorskiego oprogramowania VETO. Przeprowadzone testy oraz wykonana optymalizacja parametrów pracy spektrometru, a przede wszystkim jego aktywnej osłony, pozwoliła na redukcję tła spektrometru o 63% w całym zakresie energetycznym oraz o 65% w piku anihilacyjnym 511 keV. Dzięki temu, osiągnięto poprawę limitów detekcji dla wybranych izotopów promieniotwórczych – 210Pb, 137Cs, 40K o prawie 40%.
    The article presents design of a low-level digital gamma-ray spectrometer equipped with a germanium BEGe detector (Broad Energy Germanium), a multi-layer passive shield and five scintillation detectors playing a role of the additional, active shield. Data acquisition is carried out using a digital analyzer (digitizer) CAEN DT5725, while its analysis is performed using purposely written software VETO. As a result of conducted tests and tuning of spectrometer operating parameters (and its active shield in particular) the mean background counts rate reduction of 63% in the whole spectrum and 65% in 511 keV annihilation peak were achieved. In consequence, the detection limits have been improved by almost 40% on average for selected radioactive isotopes – 210Pb, 137Cs, 40K.
    Źródło:
    Inżynier i Fizyk Medyczny; 2020, 9, 1; 33-36
    2300-1410
    Pojawia się w:
    Inżynier i Fizyk Medyczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Promieniotwórczość naturalna skał paleozoicznych z rejonu Krzeszowic
    Natural radioactivity of the Paleozoic rocks from the area of Krzeszowice (southern Poland)
    Autorzy:
    Malczewski, D.
    Badera, J.
    Lizurek, G.
    Mirkowski, Z.
    Dorda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074494.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    skała paleozoiczna
    tuf wulkaniczny
    promieniotwórczość naturalna
    badanie in situ
    Paleozoic rocks
    tuff
    melaphyre
    porphyry
    diabase
    limestone
    natural radioactivity
    in situ gamma-ray spectrometry
    Krzeszowice
    Polska
    Opis:
    In this paper results of natural radioactivity of 40K, 208Tl, 212Pb, 212Bi, 214Pb, 214Bi and 228Ac in common rocks raw materials mined in the Krakow vicinity measured in situ using a portable gamma-ray spectrometry are presented. The study area occupies the SE edge of regional geologic unit called Krakow–Lubliniec Zone. Most Upper Paleozoic rocks exposed in this area like tuff, porphyry, limestone, dolomite, diabase and melaphyre have great economic importance and are used in building and road construction industry. The activity concentrations of 40K for the measured Paleozoic rocks ranged from 53 Bq/kg (Carboniferous limestone) to 3150 Bq/kg (Permian tuff). The activity concentrations associated with 228Ac (232Th) varied from about 7 Bq/kg (Carboniferous limestone) to 56 Bq/kg (Permian tuff), whereas activity concentrations of 226Ra (238U) ranged from 19 Bq/kg (Devonian dolomite) to 43 Bq/kg (Devonian limestone). Besides, the natural radioactivity of the Jurassic limestones (widespread in this region) was measured for comparision with Devonian and Carboniferous limestones.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 9; 815-822
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Induced physical mutagenesis and its effect in cytological behavior of Ashwagandha (Withania somnifera (L.) Dunal)
    Autorzy:
    Bharathi, T.
    Gnanamurthy, S.
    Dhanavel, D.
    Ariraman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/11331.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    physical mutagenesis
    mutagenesis
    cytological behaviour
    ashwagandha
    Indian ginseng zob.ashwagandha
    poison gooseberry zob.ashwagandha
    winter cherry zob.ashwagandha
    Withania somnifera
    medicinal plant
    chromosome
    aberration
    gamma-ray
    Opis:
    The mitotic effect of physical mutagen gamma rays was observed in the root tip cells of Ashwagandha. The Chromosome analysis has been showed as an important tool for establish variability of the plant seed by use of physical mutagen gamma rays. The gamma rays have of low wavelength and high penetrable power. The plant has tremendous medicinal values and it is known from ancient times. The dry and well matured seeds of ashwagandha were irradiated with different doses of gamma rays viz., 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 KR respectively. The chromosome number of control plant is 2n = 48. The gamma rays affect the normal cytological behavior of ashwagandha species. The chromosomal aberrations increase with increase in the doses of gamma rays to optimum level of 30KR, because it causes changes in the chromosome structure, cellular structure and metabolism of plants. The chromosome aberration like, Sticky metaphase, Precocious moment chromosome, Fragments, Anaphasic bridge, Anaphasic laggard, Telophasic laggard. The present investigation was carried out to study the cytogenetic analysis of the species Withania somnifera. The chromosomal aberration increases with increase in the doses to optimum level (50 KR) of physical mutagen gamma rays.
    Źródło:
    International Letters of Natural Sciences; 2014, 12, 2
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar indywidualnego równoważnika dawki promieniowania X i gamma za pomocą dozymetru pierścionkowego – wyniki porównań międzylaboratoryjnych
    Measurement of personal dose equivalent of X and gamma radiation by ring dosimeter: Results of intercomparison measurements
    Autorzy:
    Adamowicz, Małgorzata
    Papierz, Sylwia
    Kacprzyk, Janusz
    Kamiński, Zbigniew
    Zmyślony, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2166303.pdf
    Data publikacji:
    2014-11-05
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    porównania międzylaboratoryjne
    promieniowanie rentgenowskie i gamma
    indywidualny równoważnik dawki
    dozymetr pierścionkowy
    detektor termoluminescencyjny
    interlaboratory comparisons
    X-ray and gamma radiation
    personal dose equivalent
    ring dosimeter
    thermoluminescence detectors
    Opis:
    Wstęp: Celem pracy było potwierdzenie, na podstawie wyników porównań międzylaboratoryjnych dla dozymetrów pierścionkowych, że stosowana metoda badawcza jest odpowiednia do pomiaru indywidualnego równoważnika dawki HP(0,07). Ponadto w pracy przedstawiono procedury kalibracyjne stosowane podczas walidacji metody badawczej przed wdrożeniem do rutynowych pomiarów związanych z oceną narażenia pracowników na działanie promieniowania X i γ. Materiał i metody: Przedmiotem porównań międzylaboratoryjnych były dozymetry pierścionkowe wykonane z elastycznego tworzywa o standardowej średnicy 20 mm i z umieszczonymi wewnątrz dwoma detektorami termoluminescencyjnymi (TL) typu MTS-N - po naeksponowaniu u organizatora porównań odczytywano je za pomocą nowego, manualnego czytnika detektorów TL (prod. FIMEL, Francja). Wszystkie ekspozycje dozymetrów, przeprowadzone dla celów walidacyjnych ww. czytnika, wykonano we wzorcowych wiązkach promieniowania X i γ z zastosowaniem fantomu prętowego ISO. Metodyka wykonanych ekspozycji była odpowiednia do potrzeb pracowni oraz zgodna z metodami stosowanymi przez Europejskę Grupę ds. Dozymetrii Promieniowania (European Radiation Dosimetry Group - EURADOS) - organizatora porównań międzylaboratoryjnych o europejskim zasięgu w zakresie dozymetrii indywidualnej. Wyniki: Wykonane charakterystyki - energetyczna, dawkowa i kątowa dozymetru pierścionkowego - umożliwiły opracowanie wzoru dotyczącego oszacowania indywidualnego równoważnika dawki HP(0,07) oraz poddania go testowi weryfikacyjnemu. Stwierdzono zadowalający wynik testu oceny wielkości HP(0,07) i tym samym potwierdzono gotowość wdrożenia czytnika termoluminescencyjnego do stosowanej metody badawczej oraz uczestniczenia w porównaniach międzylaboratoryjnych. Wnioski: Laboratorium - zgodnie z wymaganiami Polskiego Centrum Akredytacji - uczestniczyło w porównaniach międzylaboratoryjnych (organizowanych przez grupę EURADOS) w zakresie pomiaru dawki równoważnej na ręce promieniowania jonizującego X i γ. Wynik porównania był pozytywny, a jego przedmiotem były dozymetry pierścionkowe. Potwierdzono tym samym prawidłowość realizowanej procedury badawczej. Med. Pr. 2013;64(5):631–637
    Background: The aim of the study was to present the results of the interlaboratory comparisons for ring dosimeters and to confirm that the applied method is suitable for measuring the personal dose equivalent HP(0.07). In addition, calibration procedures used in dosimetric measurements in persons occupationally exposed to ionizing photon radiation X and γ were presented. Materials and Methods: Ring dosimeters made of flexible plastics with the diameter of approximately 20 mm, equipped with two thermoluminescence (TL) detectors type MTS-N, were the subject of interlaboratory comparisons. Irradiated detectors were red out using a new manual TLD's reader (FIMEL, France). All TLD exposures were done for validation of TLD readers and were performed using the reference X-ray and γ beams with the ISO rod phantom. The methodology of performed exposures corresponded with the methods applied by the European Radiation Dosimetry Group (EURADOS), the European organizer of interlaboratory comparisons. Results: The energy, dose and angular characteristics of the ring dosimeter allowed to elaborate the formula for estimating and verifying the personal dose equivalent HP(0.07). The test was performed to check and confirm the correctness of the estimated characteristics. The test results were satisfactory, and thus the readiness to implement TLD reader in the used method and to participate in interlaboratory comparisons was confirmed. Conclusions: According to the requirements of the Polish Centre for Accreditation, the laboratory was participating in the interlaboratory comparison organized by EURADOS in terms of the personal dose equivalent HP(0.07). The result of the comparison was satisfactory, therefore the correctness of the testing procedure was confirmed. Med Pr 2013;64(5):631–637
    Źródło:
    Medycyna Pracy; 2013, 64, 5; 631-637
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Needle detector of X-ray and gamma radiation
    Detektor igłowy promieniowania X i gamma
    Autorzy:
    Domański, G.
    Szabatin, R.
    Brzeski, P.
    Konarzewski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/408828.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    gas detector with electron multiplication
    x-ray detector
    gamma radiation
    detektor z gazowym powielaniem elektronów
    detektor promieniowania X
    promieniowanie gamma
    Opis:
    The article presents the developed structure of the novel needle proportional gas detector (NPC – Needle Proportional Counter) used for the detection of X-rays and gamma rays. The advantage of the detector is its simple mechanical construction and the possibility of detection of incident radiation in a direction parallel to the needle. The measured energy spectrum of the isotope Fe-55 by means of the developed detector is presented.
    Artykuł przedstawia opracowaną konstrukcję nowego typu gazowego detektora igłowego, służącego do detekcji promieniowania X i gamma. Zaletą detektora jest jego prosta konstrukcja mechaniczna i możliwość detekcji promieniowania w kierunku równoległym do igły. Zmierzono widmo energetyczne izotopu Fe-55 opracowanym detektorem.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 1; 121-124
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distributed radiation monitoring system for linear accelerators based on CAN bus
    Autorzy:
    Kozak, T.
    Makowski, D.
    Napieralski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/397933.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    obszar pod kontrolą sieci
    dozymetria promieniowania gamma
    dozymetria promieniowania neutronowego
    akcelerator liniowy
    controller area network
    gamma radiation dosimetry
    neutron radiation dosimetry
    radiation sensing Field Effect Transistor
    linear accelerator
    X-ray free electron laser
    Opis:
    Gamma and neutron radiation is produced during the normal operation of linear accelerators like Free-Electron Laser in Hamburg (FLASH) or X-ray Free Electron Laser (X-FEL). Gamma radiation cause general degeneration of electronics devices and neutron fluence can be a reason of soft error in memories and microcontrollers. X-FEL accelerator will be built only in one tunnel, therefore most of electronic control systems will be placed in radiation environment. Exposing control systems to radiation may lead to many errors and unexpected failure of the whole accelerator system. Thus, the radiation monitoring system able to monitor radiation doses produced near controlling systems is crucial. Knowledge of produced radiation doses allows to detect errors caused by radiation, schedule essential replacement of control systems and prevent accelerator from serious damages. The paper presents the project of radiation monitoring system able to monitor radiation environment in real time.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 1; 52-55
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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