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Tytuł:
EPR study on biominerals as materials for retrospective dosimetry
Autorzy:
Sadło, J.
Michalik, J.
Stachowicz, W.
Strzelczak, G.
Dziedzic-Gocławska, A.
Ostrowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/146095.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dosimetry
EPR dating
accidental dosimetry
hydroxyapatite
Opis:
Stable paramagnetic species, induced by irradiation in biominerals, can be successfully used as an EPR dosimeter in numerous domains of scientific activity. In hydroxyapatite, the main mineral component of bones, the most stable signal is assigned to CO2 - ion radical. The signal is dose dependent and allows to determine the absorbed dose in a wide range till 20 kGy, with detection limit for tooth enamel below 1 Gy. The additive dose method was applied to EPR dating of archeological objects and EPR dosimetry after accidental overexposing during radiotherapy. It was found that the age of remains excavated from the “tomb of giants” belonging to Nuraghic culture developed in Sardinia island is about 3160 years old (1160 years BC). The dose obtained by patients during the accident at the Białystok Oncological Center was evaluated at about 75 Gy. Searching for potential dosimeters among other biominerals shows that mollusc shells have very promising properties. The lowest dose detection limit was found for an Arcidae shell. Both fresh water and sea mollusc shells are useful to be used for dosimetry in the low dose range.
Źródło:
Nukleonika; 2006, 51,suppl.1; 95-100
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization System to Minimize Exposure to Occupational Noise
Autorzy:
Reis, Déborah
Miranda, João
Reis, Jorge
Duarte, Marcus
Powiązania:
https://bibliotekanauki.pl/articles/2141683.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustics
noise
optimization
dosimetry
Opis:
This research deals with the development of an optimization system to minimize employee noise exposure in the work environment. It is known from the literature that continuous exposure to high noise levels can cause heart overload, stress, fatigue, and increase accident numbers at a production line. Thus, it is necessary to develop acoustic solutions at an industrial level that could minimize failures and accident occurrences. The rules that regulate occupational noise exposures allow an assessment of the degrees of exposure and subsequent corrections of working conditions. It is observed that the exposure is necessary for further evaluation and correction. Therefore, this research proposes to simulate occupational noise exposure conditions through mathematical models implemented in C++, using the GUROBI linear optimization package and to act previously to minimize ONIHL (Occupational Noise-Induced Hearing Loss). One of this work results is based on Doses Values, TWA (Time Weighted Average) and Distances Covered, using these three factors simultaneously through the optimization, it obtains a route that minimizes exposure and avoids ONIHL. Although there is a need for balanced doses between employees, to this end, the Designation Problem was implemented. Thus, with the routes obtained by optimization, an efficient allocation task was made for the maintenance crew, resulting in minimized and balanced doses. This model was applied to a real industrial plant that will not be identified, only methodology and results obtained will be presented.
Źródło:
Archives of Acoustics; 2022, 47, 1; 15-23
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Air-crew exposure to cosmic radiation on board of Polish passenger aircraft
Autorzy:
Bilski, P.
Olko, P.
Horwacik, T.
Powiązania:
https://bibliotekanauki.pl/articles/147249.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dosimetry
cosmic radiation
radiation protection
Opis:
To establish the need for individual monitoring of air crew, exposure of air-crew members of Polish airlines LOT to cosmic radiation has been determined and several dosimetry methods tested in flight. Passive radiation dosimetry (using thermoluminescent LiF and chemically etched CR-39 track detectors) was supported by calculations with the CARI computer code. We found that the air crew of most of the LOT aircraft studied (with the exception of those flying ATR propeller aircraft) may somewhat exceed or, in certain conditions (depending on solar activity), may considerably exceed the effective dose level of 1 mSv per year. For crew members flying regularly on B-767 aircraft, the estimated yearly effective dose ranged between 2 mSv and 5 mSv, depending mainly on flying frequency and solar activity. During periods of enhanced intensity of cosmic radiation (i.e. during minimum solar activity) the effective doses could be close to the level of 6 mSv per year.
Źródło:
Nukleonika; 2004, 49, 2; 77-83
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distrubuted system for noise threat evaluation based on psychoacoustic measurements
Autorzy:
Kotus, J.
Szczodrak, M.
Czyżewski, A.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/220609.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise
environmental noise
dosimetry
measurements
Opis:
An innovative system designed for the continuous monitoring of acoustic climate of urban areas was presented in the paper. The assessment of environmental threats is performed using online data, acquired through a grid of engineered monitoring stations collecting comprehensive information about the acoustic climate of urban areas. The grid of proposed devices provides valuable data for the purpose of long and short time acoustic climate analysis. Dynamic estimation of noise source parameters and real measurement results of emission data are utilized to create dynamic noise maps accessible to the general public. This operation is performed through the noise source prediction employing a propagation model being optimized for computer cluster implementation requirements. It enables the system to generate noise maps in a reasonable time and to publish regularly map updates in the Internet. Moreover, the functionality of the system was extended with new techniques for assessing noise-induced harmful effects on the human hearing system. The principle of operation of the dosimeter is based on a modified psychoacoustic model of hearing and on the results of research performed with participation of volunteers concerning the impact of noise on hearing. The primary function of the dosimeter is to estimate, in real time, auditory effects which are caused by exposure to noise. The results of measurements and simulations performed by the system prototype are depicted and analyzed. Several cases of long-term and short-term measurements of noise originating from various sources were considered in detail. The presented outcomes of predicted degree of the hearing threshold shift induced during the noise exposure can increase the awareness of harmfulness of excessive sound levels.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 219-230
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Chronic Dose Assessment of Three Critical Organs for Liver Scintigraphy with Using Cr-51
Autorzy:
Maranci, Ö.
Tugrul, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031760.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Cr-51
dosimetry
phantom
scintigraphy
TRIGA
Opis:
In this study, a dosimetric study was observed by using Cr-51 gamma radioisotope on liver scintigraphy. In this context, the source organ is determined as liver and it is aimed the evaluation of measuring doses from source organ to selected three critical organs (thyroid, gonad, and brain). An antropomorphic torso phantom has been preferred in the experiments. The measurements of critical organs doses were examined for chronic effects. Moreover, the chronic effect of Cr-51 radioisotope on critical organs was determined as cumulative dose. Thermoluminescent dosimeters were used for chronic dose assessment. In the experiments, lithium fluoride (LiF) (TLD-100) detectors were used and they were provided from Turkish Atomic Energy Authority - Cekmece Nuclear Research and Training Center and calibrated in there. Within this study, the evaluation of the cumulative doses by using Cr-51 for three critical organs was observed with an original setup by using anthropomorphic torso phantom experimentally.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 476-478
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody pomiaru małych ładunków i prądów jonizacyjnych w ochronie radiologicznej i radioterapii
Autorzy:
Knyziak, A. B.
Powiązania:
https://bibliotekanauki.pl/articles/1425756.pdf
Data publikacji:
2014
Wydawca:
Główny Urząd Miar
Tematy:
promieniowanie
dozymetria
dawkomierze
radiation
dosimetry
dosimeters
Opis:
Artykuł jest streszczeniem rozprawy doktorskiej o tym samym tytule, która została obroniona przez autora na Wydziale Mechatroniki Politechniki Warszawskiej. W niniejszym artykule przedstawiono metody pomiaru małych prądów DC i ładunków elektrycznych, które są stosowane powszechnie w dozymetrii promieniowania jonizującego. Artykuł prezentuje ich zalety i wady w różnych aplikacjach z naciskiem na zastosowanie w systemach pomiarowych, wykorzystywanych na stanowiskach wzorców pierwotnych i wtórnych kermy w powietrzu i dawki pochłoniętej w wodzie.
Źródło:
Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar; 2014, 1-2 (4-5); 18-24
2300-8806
Pojawia się w:
Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Żele radiochromiczne przyszłością dozymetrii radioterapeutycznej
Radiochromic gels as the future of radiotherapeutic dosimetry
Autorzy:
Bruszewska, Anna
Górska, Monika
Mizgajska, Ewa
Poświatowska, Klaudia
Powiązania:
https://bibliotekanauki.pl/articles/32881337.pdf
Data publikacji:
2020
Wydawca:
Fundacja PSC
Tematy:
dosimetry
dose distribution
radiotherapy
radiochromic gels
Opis:
In a present work an attempt was made to describe the radiochromic gels used in radiotherapeutic dosimetry to review the available solutions. Articles related to the composition and production of these gels were analyzed. Additionally, the application and properties of 3D dosimeters, such as radiochromic gels, were discussed. Cancer is one of the biggest problem of modern medicine and the reason to develop new and more accurate dosimeters. The gels discussed in this article allow to obtain promising results and confirm the validity of the continuation of research on both current and new solutions used in teleradiotherapy dosimetry.
Źródło:
Alcumena. Pismo Interdyscyplinarne; 2020, 3(3); 19-33
2719-9851
Pojawia się w:
Alcumena. Pismo Interdyscyplinarne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dosimetric characteristics of active solid state detectors in a 60 MeV proton radiotherapy beam
Autorzy:
Sowa, U.
Nowak, T.
Michalec, B.
Mierzwińska, G.
Swakoń, J.
Olko, P.
Powiązania:
https://bibliotekanauki.pl/articles/146780.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
diamond dosimeter
diode Si
dosimetry
proton beam
Opis:
Several solid state detectors, such as dosimetric diodes, MOSFET detectors or diamond detectors are used for quality control of radiotherapy beams. The goal of this work was to determine dosimetric properties of the PTW diamond detector (DD) and the PTW silicon diode in the 60 MeV therapeutic beam (practical range in water Rp = 29.17 mm) located at the Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN, Kraków). A PTW Markus ionization chamber was used as a reference device. The empirical correction factor for diamond detector, kDD(Rresidual), introduced in the Technical Report Series of IAEA, TRS-398 [9] as a function of beam quality, Rresidual, was found to decrease from 1.12 for Rresidual = 1.5 mm to 1.04 for Rresidual = 26 mm. The reproducibility of response of DD and PTW diodes in the proton filed did not exceed 0.11%. Our results show that diamond detectors and dosimetric diodes are useful tools for quality assurance (QA) of therapeutic proton beam, but each type of detectors has specific properties which should be taken into account when choosing particular application.
Źródło:
Nukleonika; 2012, 57, 4; 491-495
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR study of γ-irradiated feather keratin and human fingernails concerning retrospective dose assessment
Autorzy:
Strzelczak, G.
Sterniczuk, M.
Sadło, J.
Kowalska, M.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/148231.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EPR spectroscopy
keratin
melanin
radicals
fingernails
dosimetry
Opis:
In this paper we report the results of comparative EPR studies on free radicals generated in γ-irradiated powder samples of feather keratin powder and human fingernails. In degassed samples of both materials irradiated at 77 K the major component of EPR spectrum represents sulphur-centred radicals in cysteine residues. It quickly decays after air admission at room temperature while a singlet assigned to semiquinone melanin radicals remains the only one seen. The singlet recorded with fingernails decays slowly at room temperature and might be potentially useful for dose assessment by EPR. The advantages and limitations of fingernails EPR dosimetry are discussed.
Źródło:
Nukleonika; 2013, 58, 4; 505-509
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods and measurements in radiation synovectomy with 90Y of knee joint dosimetry
Autorzy:
Kempińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/147678.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Yttrium-90
dosimetry
synovectomy
radiation protection
gammacamera
knee joint
Opis:
Radioisotope synovectomy is based upon an yttrium-90 colloid injected into the knee joint (the usual injected activity ranges from 111 MBq to 222 MBq per joint). Execution of the procedure needs participation of a nuclear medicine specialist as well as an orthopedist or a rheumatologist and a technologist who prepares radiopharmaceuticals. All of these participants are exposed to ionizing radiation. The ionization doses for patients and personnel are dependent not only on the activity injected, but also on the method and process of injection as well as the radioactivity measurement procedure used. In the experiments performed, a significant influence of the biodistribution of the radioisotopic substance on the exposure results has been observed.
Źródło:
Nukleonika; 2008, 53, suppl. 1; 39-43
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BEZPIECZEŃSTWO ELEKTROWNI JĄDROWYCH W KONTEKŚCIE ZAGROŻEŃ RADIACYJNYCH – ASPEKTY TEORETYCZNE
SAFETY OF NUCLEAR POWER PLANTS IN THE CONTEXT OF RADIOACTIVE HAZARDS – THEORETICAL ASPECTS
Autorzy:
Zaorski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/508698.pdf
Data publikacji:
2017
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
safety
radiation doses
dosimetry
nuclear energy
defensein depth
Opis:
The development and construction of the first nuclear power plants became the basis for the emergence of a new branch of the economy, an economy based on the use of radioactive means. Threats of a radiological nature generated by this new qualitative branch of the economy are not related solely to the operation of the nuclear power plant. Transport, decontamination or the process of recovering spent nuclear fuel for reuse in special reactors are also a source of potential threats. And these hazards do not only apply to persons working in nuclear power plants or having contact with nuclear fuel. They also affect the security of the population in a wider scope, becoming the subject of interest for specialists dealing with common security. The aim of the article is an attempt to systematize and approximate the issue of radiation hazards related to the construction and operation of nuclear power plants. The tragedies of 1986 in the USSR and 2011 in Japan show the magnitude of losses and human suffering in the event of a radiation event with signs of a catastrophe. In article, author explained the concept and the essence of radiation hazards, including the risk assessment of this type of threats in Poland, presented the general principles of employee protection and defense against failures used in nuclear power plants, as well as the concept of the so-called defense in depth.
Źródło:
Security, Economy & Law; 2017, 4/2017 (XVII)
2353-0669
Pojawia się w:
Security, Economy & Law
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aparatura dozymetryczna stosowana w ochronie radiologicznej przy pracy z promieniowaniem jonizacyjnym
Dosimetry apparatus used in radiation protection at work with ionizing radiation
Autorzy:
Filipecki, J.
Chamerski, K.
Golis, E.
Hyla, M.
Powiązania:
https://bibliotekanauki.pl/articles/103566.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
promieniowanie jonizujące
radiologia
dozymetria
ionizing radiation
radiology
dosimetry
Opis:
Promieniowanie jonizacyjne, czyli promieniowanie rentgenowskie i promieniowanie jądrowe, głównie typu gamma, alfa i beta, przechodząc przez materię, powoduje jej jonizację i w sposób destrukcyjny oddziałuje na organizmy żywe. Proces oceny ryzyka wynikający z zawodowego narażenia na promieniowanie jonizujące oparty jest na systemie ochrony radiologicznej. Ochrona radiologiczna to całokształt działań i przedsięwzięć zmierzających do zapobiegania narażeniu ludzi i środowiska na promieniowanie jonizujące. W tym celu wykorzystuje się zespół przyrządów przeznaczonych do wykrywania i pomiarów promieniowania jonizującego. W niniejszej pracy przedstawiamy powstawanie, charakterystykę i własności promieniowania jonizującego, a także istniejące ryzyko na stanowiskach pracy, gdzie występuje to promieniowanie, oraz budowę, zasady działania i wykorzystanie podstawowej aparatury dozymetrycznej stosowanej w ochronie radiologicznej.
Ionizing radiation or X-rays and nuclear radiation, particularly gamma, alpha and beta, passing through matter causes the ionization and a devastating effects on living organisms. The risk assessment process resulting from occupational exposure to ionizing radiation, based on the system of radiological protection. Radiation protection encompasses all activities and measures aimed at the prevention of human and environmental exposure to ionizing radiation. For this purpose, a system of instruments for detection and measurements of ionizing radiation is used. In this paper, we present the formation, characteristics and properties of ionizing radiation. Also describes the potential risks in workplaces where there is radiation and the construction, operation, and utilization of basic dosimetric equipment used in radiological protection.
Źródło:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2013, T. 1; 69-90
2300-5343
Pojawia się w:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with 13C
Autorzy:
Sadło, J.
Bugaj, A.
Strzelczak, G.
Sterniczuk, M.
Jaegermann, Z.
Powiązania:
https://bibliotekanauki.pl/articles/146101.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
aragonite
calcite
dosimetry
EPR spectroscopy
γ-irradiation
radicals
Opis:
In calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3 – (orthorhombic symmetry, bulk and bonded to surface), CO3 3–, NO3 2–, O3 –, and in aragonite CO2 – (isotropic and orthorhombic symmetry) depending on the type of calcium carbonate used. For calcium carbonates enriched with 13C more detailed information about the formed radicals was possible to be obtained. In both natural (white coral) and synthetic aragonite the same radicals were identifi ed with main differences in the properties of CO2 – radicals. An application of Q-band EPR allowed to avoid the signals overlap giving the characteristics of radical anisotropy.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 429-434
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alanine dosimetry of 60 MeV proton beam - preliminary results
Autorzy:
Michalec, B.
Mierzwińska, G.
Sowa, U.
Ptaszkiewicz, M.
Nowak, T.
Swakoń, J.
Powiązania:
https://bibliotekanauki.pl/articles/146730.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alanine
dosimetry
electron paramagnetic resonance (EPR)
proton beam
Opis:
Electron paramagnetic resonance (EPR) spectrometry (X-band) was used to determine the dose absorbed in alanine detectors, of different shapes and different alanine content, irradiated with Co-60 gamma rays and in a 60 MeV proton beam. The goal of our study was to confirm applicability of alanine as a passive detector in therapeutic proton beam. In the paper dose response characteristic and relative efficiency of alanine are shown. The study confirmed that alanine detectors with a high alanine content (ca. 95%) may be a useful and convenient tool for dose measurements in proton beams, used for eye cancer treatment.
Źródło:
Nukleonika; 2012, 57, 4; 503-506
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of the basic photon and electron dosimetry data for Neptun 10PC linear accelerators
Autorzy:
Shokrani, P.
Monadi, S.
Powiązania:
https://bibliotekanauki.pl/articles/147666.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dosimetry
photon beam
electron beam
linear electron accelerator
Opis:
. In recent years the similarity of dosimetric characteristics of modern linear accelerators with the same make, model and nominal energy, has become more common. The goal of this study was to quantitatively investigate the reproducibility of the basic photon and electron dosimetry data from Neptun 10PC accelerators across the institutions. In the current study, the photon and electron dosimetry data collected during acceptance and initial commissioning of six Neptun 10PC linear accelerators are analyzed. The dates of original installations of these six machines were evenly spread out over a 5 year period and the series of measurements were conducted during an average of 1-2 months after original installations. All units had identical energies and beam modifiers. For photon beams, the collected data include depth dose data, output factors and beam profile data in water. For electron beams, in addition to depth dose data and output factors, the effective source skin distance for 10 × 10 cm field size is also presented. For most beam parameters the variation (one standard deviation), was less than 1.0% (less than 2% for 2 parameters). A variation of this magnitude is expected to be observed during annual calibration of well-maintained accelerators. In conclusion, this study is presenting a consistent set of data for Neptun 10PC linear accelerators. This consistency implies that for this model, a standard data set of basic photon and electron dosimetry could be established, as a guide for future commissioning, beam modeling and quality assurance purposes.
Źródło:
Nukleonika; 2008, 53, 4; 181-185
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
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