Temat: dosimetry - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: EPR study on biominerals as materials for retrospective dosimetry
Autorzy:: Sadło, J.
Michalik, J.
Stachowicz, W.
Strzelczak, G.
Dziedzic-Gocławska, A.
Ostrowski, K.
Tematy:: dosimetry
EPR dating
accidental dosimetry
hydroxyapatite; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146095.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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
Tematy:: dozymetria RPL
dozymetria kliniczna
dozymetria indywidualna
RPL dosimetry
clinical dosimetry
personal dosimetry; Pokaż więcej
Wydawca:: Indygo Zahir Media
Powiązania:: https://bibliotekanauki.pl/articles/2146812.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Patient exposure to X-ray radiation during abdominal aorta and lower limb digital subtraction angiography
Autorzy:: Błaszak, Madgalena A.
Majewski, Wacław
Majewska, Natalia
Juszkat, Robert
Opis:: Background: The main aim of this study was to find out what is the risk caused by ionizing radiation during digital subtraction angiography (DSA) for abdominal aorta and lower limb examinations. Material\Methods: The study is based on a large group of patient data subjected to a complex analysis of fluoroscopy time, exposure time, air kerma values, and dose-area product (DAP). Measurements were performed on 449 patients with intra-arterial (IA DSA) contrast administration. Results and Median DAP value for fluoroscopy was 5.4 Gy-cm2 and for exposure 51.7 Gy-cm2. On exposure the patients received 94% of the total DAP although this examination takes only 0.1% of the total examination time. For this reason, small changes in the exposure time may result in a considerable reduction in the radiation received by the patient. There was good correlation between DAP values and the fluoroscopy time (r=0.78), while the correlation between DAP and the exposure time was much poorer (r=0.39). It was also found that gender was a differentiating factor neither both fluoroscopy (F[1, 449]=0.01, p>0.05) nor exposure time (F[1, 449]=0.42, p>0.05).
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Optimization System to Minimize Exposure to Occupational Noise
Autorzy:: Reis, Déborah
Miranda, João
Reis, Jorge
Duarte, Marcus
Tematy:: acoustics
noise
optimization
dosimetry; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2141683.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Air-crew exposure to cosmic radiation on board of Polish passenger aircraft
Autorzy:: Bilski, P.
Olko, P.
Horwacik, T.
Tematy:: dosimetry
cosmic radiation
radiation protection; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147249.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Distrubuted system for noise threat evaluation based on psychoacoustic measurements
Autorzy:: Kotus, J.
Szczodrak, M.
Czyżewski, A.
Kostek, B.
Tematy:: noise
environmental noise
dosimetry
measurements; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220609.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Analiza wyników rutynowego monitoringu narażenia personelu na promieniowanie jonizujące w miejscach pracy
Analysis of the results of personal monitoring to ionizing radiation at workplaces
Autorzy:: Papierz, Sylwia
Domienik-Andrzejewska, Joanna
Tematy:: narażenie zawodowe
promieniowanie jonizujące
dozymetria indywidualna
monitoring dawek
dozymetria termoluminescencyjna
dozymetria filmowa
occupational exposure
ionizing radiation
individual dosimetry
dose monitoring
thermoluminescent dosimetry
film dosimetry; Pokaż więcej
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:: https://bibliotekanauki.pl/articles/55991828.pdf Link otwiera się w nowym oknie
Opis:: Wstęp W pracy zaprezentowano wyniki przeprowadzonych przez Zakład Ochrony Radiologicznej (ZOR) Instytutu Medycyny Pracy (IMP) w Łodzi w 2022 r. pomiarów dozymetrycznych dla osób zawodowo narażonych na promieniowanie rentgenowskie oraz gamma. Materiał i metody Ocena dawki efektywnej w ramach dozymetrii indywidualnej prowadzona była metodami fotometryczną lub termoluminescencyjną thermoluminescent dosimetry – TLD). Dodatkowo na podstawie wyłącznie metody TLD wykonywane były również pomiary przestrzennego równoważnika dawki H*(10) oraz indywidualnych równoważników dawek Hp(0,07) i Hp(3). W 2022 r. ZOR IMP objął pomiarami łącznie >30 000 osób zatrudnionych w >4500 zakładach, głównie w placówkach służby zdrowia. Wszystkie pomiary wykonywane były zgodnie z akredytowanymi procedurami badawczymi (zakres akredytacji AB 327). Wyniki W 2022 r. średnia roczna dawka Hp(10) była równa 0,26 mSv, natomiast Hp(0,07) zmierzona metodą dozymetrii pierścionkowej oraz nadgarstkowej wynosiła, odpowiednio, 0,63 mSv oraz 0,78 mSv. Z kolei średnia wartość Hp(3) była równa 0,21 mSv. W 2022 r. nie odnotowano ani jednego przypadku przekroczenia limitu rocznego dawki wśród osób objętych pomiarami przez IMP. Wnioski Zgromadzone w bazie „Dozymetrii” IMP dane oraz szczegółowa analiza rocznych dawek otrzymywanych przez osoby zawodowo narażone na promieniowanie jonizujące i objęte pomiarami przez ZOR IMP w 2022 r. wskazują na dobrze funkcjonujący system ochrony radiologicznej w Polsce.
Background The paper presents the results of dosimetric measurements routinely performed by the Radiation Protection Department of the Nofer Institute of Occupational Medicine (NIOM) in Łódź in 2022 for people occupationally exposed to X and γ radiation. Material and Methods The evaluation of the effective dose as part of individual dosimetry was provided using the film or thermoluminescent dosimetry (TLD). Additionally, based exclusively on the TLD method, measurements of the ambient dose equivalent H*(10) and personal dose equivalents Hp(0.07) and Hp(3) were performed. In 2022, the dosimetric service of the Radiological Protection Department of the NIOM covered >30 000 workers employed in >4500 laboratories (mainly health care departments). All measurements were performed in accordance with accredited research procedures (number AB 327). Results In 2022, the average annual dose of Hp(10) was equal to 0.26 mSv, whereas Hp(0.07) measured using ring and wrist dosimetry was equal to 0.63 mSv and 0.78 mSv, respectively. In turn, the average Hp(3) value was 0.21 mSv. In 2022, there was not a single case of exceeding the annual dose limit among people measured by the NIOM. Conclusions The data collected in the “Dosimetry” database of the NIOM and a detailed analysis of annual doses received by people occupationally exposed to ionizing radiation indicate a well-functioning radiological protection system in Poland.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Wykorzystanie obrazów transit-EPID w kontroli jakości radioterapii – przegląd piśmiennictwa
The use of the transit-EPID images in the radiotherapy quality assurance – literature review
Autorzy:: Borowska, Patrycja
Paluszyńska, Marta
Sobocka-Kurdyk, Urszula
Tematy:: dozymetria transit
dozymetria in vivo
EPID
kontrola jakości
transit dosimetry
in vivo dosimetry
quality assurance; Pokaż więcej
Wydawca:: Indygo Zahir Media
Powiązania:: https://bibliotekanauki.pl/articles/58906379.pdf Link otwiera się w nowym oknie
Opis:: Wraz z rozwojem coraz bardziej złożonych technik napromieniania pacjenta wiązkami zewnętrznymi, weryfikacja prawidłowości ich realizacji staje się coraz większym wyzwaniem. Jednym z narzędzi, które budzi szczególne zainteresowanie ze względu na swój potencjał zastosowania w kontroli jakości leczenia i powszechną dostępność, jest kaseta portalowa (ang. Electronic Portal Imaging Device, EPID). Koncepcje wykorzystania obrazów transit-EPID (tj. zarejestrowanych podczas seansu terapeutycznego za pomocą EPID) obejmują zarówno próby rekonstrukcji dawki zdeponowanej w pacjencie (począwszy od wyznaczenia „midpoint dose” dla leczenia konformalnego, na rekonstrukcji rozkładu 3D dawki skończywszy), a także porównanie obrazów z poszczególnych frakcji leczenia z obrazem referencyjnym w celu monitorowania zmian anatomicznych i ruchomości wewnętrznej narządów pomiędzy frakcjami leczenia.
As the complexity of developed techniques in External Beam Radiotherapy (EBRT) rises, the Quality Assurance (QA) of the delivery of treatment becomes increasingly challenging. One of the tools that is of particular interest due to its potential applicability in QA and common availability is the Electronic Portal Imaging Device (EPID). Approaches to utilization of transit-EPID images (i.e. images acquired by EPID during the treatment session) include reconstruction of the dose delivered to the patient, as well as simple comparisons of current and baseline transit-EPID images in order to track anatomical changes and inter fraction internal organ motion.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Musicians’ daily sound exposure assessed by full-day dosimetry
Autorzy:: Pietrzak, Agnieszka Paula
Tematy:: sound exposure
musicians
noise dosimetry
full-day dosimetry
ekspozycja dźwięku
muzycy
dozymetria hałasowa
dozymetria całodzienna; Pokaż więcej
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/127730.pdf Link otwiera się w nowym oknie
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 (L_EX,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 (L_EX,8h) are determined for each instrument.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A hand phantom for radiological measurements
Autorzy:: Majowska, B.
Tuszyński, M.
Tematy:: thermoluminescence dosimetry
TLD
radiological protection
phantom; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148660.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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