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Wyświetlanie 1-15 z 59
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:
Zastosowanie dozymetrii radiofotoluminescencyjnej RPLD w dozymetrii indywidualnej i klinicznej
Application of RPLD radio-photoluminescent dosimetry in individual and clinical dosimetry
Autorzy:
Dudała, Joanna
Fałowska, Olga
Powiązania:
https://bibliotekanauki.pl/articles/2146812.pdf
Data publikacji:
2019
Wydawca:
Indygo Zahir Media
Tematy:
dozymetria RPL
dozymetria kliniczna
dozymetria indywidualna
RPL dosimetry
clinical dosimetry
personal dosimetry
Opis:
W artykule przedstawiono zasadę działania dozymetrów radiofotoluminescencyjnych w postaci szkieł fosforowych – RPLGD oraz charakterystyczne cechy stanowiące o ich konkurencyjności w stosunku do innych metod pasywnych stosowanych w dozymetrii. Podsumowano krótko rozwój metody RPLG na przestrzeni lat oraz wskazano przykłady wykorzystania klinicznego.
The article presents the principle of operation of radiofotoluminescence dosimeters in the form of phosphor glass – RPLGD and characteristic features that determine their competitiveness in relation to other passive methods used in dosimetry. The development of the RPLG method has been summarized and examples of clinical use have been showed.
Źródło:
Inżynier i Fizyk Medyczny; 2019, 8, 6; 435--438
2300-1410
Pojawia się w:
Inżynier i Fizyk Medyczny
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:
A hand phantom for radiological measurements
Autorzy:
Majowska, B.
Tuszyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/148660.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
thermoluminescence dosimetry
TLD
radiological protection
phantom
Opis:
The paper presents the construction of a hand phantom and its usefulness for radiological measurements. Situations when the hand is exposed to ionizing radiation stimulated the invention of this phantom. An extremity dosimeter was placed on the middle finger of the phantom. All measured doses are relative. The doses were compared with the dose from the extremity dosimeter. The aim of this paper was not to show values of the measured doses in legal units but the authors wanted to show the difference between the dose received by the extremity dosimeter and the doses measured on the inside of the hand phantom. High-sensitive LiF:Mg,Cu,P thermoluminescence detectors were used for the measurements because of their small size and close tissue equivalence. The hand phantom makes it possible to acquire the dose distribution on the inside of the hand. The authors suggested the calculation of the coefficients: the average hand phantom coefficient CHPhAV and the maximum hand coefficient CHPhmax from phantom measurements. The extremity dosimeter dose estimates according to the recommended coefficients allowed to obtain more reliable values.
Źródło:
Nukleonika; 2005, 50, 4; 167-172
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Musicians’ daily sound exposure assessed by full-day dosimetry
Autorzy:
Pietrzak, Agnieszka Paula
Powiązania:
https://bibliotekanauki.pl/articles/127730.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
sound exposure
musicians
noise dosimetry
full-day dosimetry
ekspozycja dźwięku
muzycy
dozymetria hałasowa
dozymetria całodzienna
Opis:
In day-to-day life student musicians are often exposed to high-level sounds, that may be damaging for their hearing. At music universities, there are various obligatory activities, such as playing in the symphony or wind orchestra, playing in chamber ensembles or a Big Band. Many hours of individual practice is also mandatory. In every one of these activities, sound pressure levels are often high and the daily sound exposure levels often exceed the permissible limit of 85 dB. In this study, the exemplary results of the daily sound exposure are shown for a group of music students. In contrast to other studies, the measurements were carried out throughout the entire duration of the typical workday, so the calculated daily sound exposure level (LEX,8h) is based on factual data, not estimations. Data concerning the A-weighted equivalent continuous sound pressure level in the function of time are presented for musicians playing the flute, clarinet, double-bass, percussion, trombone, trumpet and French horn, for every activity (e.g. lesson, rehearsal, concert). The daily sound exposure level values (LEX,8h) are determined for each instrument.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taurine-EVA copolymer-paraffin rods dosimeters for EPR high-dose radiation dosimetr
Autorzy:
Maghraby, A. M.
Mansour, A.
Abdel-Fattah, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/147366.pdf
Data publikacji:
2014
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EPR
ESR
radiation dosimetry
taurine
alanine
Opis:
Taurine/EPR rods (3 × 10 mm) have been prepared by a simple technique in the laboratory where taurine powder was mixed with a molten mixture of paraffin wax and an ethylene vinyl acetate (EVA) copolymer. The binding mixture EVA/Paraffin does not present interference or noise in the EPR signal before or after irradiation. The rods show good mechanical properties for safe and multi-use handling. An EPR investigation of radiation induced radicals in taurine rods revealed that there are two types of radicals produced after exposure to gamma radiation (60Co). EPR spectra were recorded and analyzed – also the microwave power saturation and modulation amplitude were studied and optimized. Response of taurine to different radiation doses (1.5–100 kGy) was studied and found to follow a linear relationship up to 100 kGy. Radiation induced radicals in taurine persists and showed a noticeable stability over 94 days following irradiation. Uncertainities associated with the evaluation of radiation doses using taurine dosimeters were discussed and tabulated. It was found that taurine possesses good dosimetric properties using EPR spectroscopy in high doses in addition to its simple spectrum.
Źródło:
Nukleonika; 2014, 59, 1; 9-13
0029-5922
1508-5791
Pojawia się w:
Nukleonika
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:
Modelling the frequencies of chromosomal aberrations in peripheral lymphocytes of patients undergoing radiotherapy
Autorzy:
Urbanik, W.
Kukołowicz, P.
Kuszewski, T.
Góźdź, S.
Wójcik, A.
Powiązania:
https://bibliotekanauki.pl/articles/148614.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
biological dosimetry
chromosomal aberration
peripheral lymphocytes
radiotherapy
Opis:
Recently, several attempts have been undertaken to correlate in vitro calibration curves with observed frequencies of chromosomal aberrations and micronuclei in lymphocytes of patients undergoing radiotherapy. The aim of such correlations is the search for a biological method to reconstruct the dose received during radiotherapy. While the in vitro dose-response curves are linear-quadratic, the observed in vivo relationship is usually linear and there is some controversy as to the nature of the observed linearity. We have, therefore, constructed a model to calculate the frequencies and distributions of chromosomal aberrations in lymphocytes of patients undergoing conventional radiotherapy. The model assumes that each fraction of radiation induces a certain number of Poisson-distributed aberrations in the irradiated blood volume. In addition, a simplified assumption is made that lymphocytes flow freely inside the body of the patient and no elimination of cells occurs. The model yields linear dose response curves. The steepness of the curves increases with increasing size of irradiated block of tissue (referred to as irradiated volume) and increasing dose per fraction. The distributions of aberrations become increasingly overdispersed with increasing dose per fraction but are independent of the number of radiation fractions. The modelled dose-response curves agree well with the majority of published experimental results. Given the simple assumptions made, this indicates that cell elimination, which occurs during radiotherapy does not bias the results obtained experimentally. The linearity of the dose response-curve results from the fractionated irradiation. Hence, great care should be applied when attempting to use standard, linear-quadratic calibration curves to estimate the doses received by patients during radiotherapy.
Źródło:
Nukleonika; 2003, 48, 1; 3-8
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dosimetry of 131 I for Occupational Radiation Workers by Whole Body Counting System
Autorzy:
Rahman, M. S.
Haydar, M. A.
Patwary, M. K. A.
Shome, S. M.
Paul, S.
Paul, D.
Meaze, A. K. M. M. H.
Powiązania:
https://bibliotekanauki.pl/articles/411910.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Internal Dosimetry
Whole Body Counter
IMBA
131I
Opis:
Internal radiation dosimetry of occupational radiation workers due to inhalation of 131 I during maintenance at iodine 131 I hot cell of Radioisotope Production Division (RIPD) of Bangladesh Atomic Energy Commission have been performed with Whole Body Counter (WBC) containing two large size NaI detector. The contaminated radioactivity of the radiation workers by 131 I was immediately conducted using a WBC (CANBERRA, FASTSCAN model 2250) and counting was repeated again a few days later. The performance of whole body counter was checked by CANBERRA transfer phantom (model 2257) with a mixed source (20 ml vial). The intake was calculated by Apex-Invivo counting software and then corresponding dose in thyroid were estimated by using Integrated Modules for Bioassay Analysis (IMBA) Professional Plus code modules. The body activity due to intake of 131 I and the total effective and equivalent dose in thyroid were also estimated and discussed.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 21-27
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 59

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