Document Detail


Mathematical modeling of a survey-meter used to measure radioactivity in human thyroids: Monte Carlo calculations of the device response and uncertainties.
MedLine Citation:
PMID:  22245289     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This paper presents results of Monte Carlo modeling of the SRP-68-01 survey meter used to measure exposure rates near the thyroid glands of persons exposed to radioactivity following the Chernobyl accident. This device was not designed to measure radioactivity in humans. To estimate the uncertainty associated with the measurement results, a mathematical model of the SRP-68-01 survey meter was developed and verified. A Monte Carlo method of numerical simulation of radiation transport has been used to calculate the calibration factor for the device and evaluate its uncertainty. The SRP-68-01 survey meter scale coefficient, an important characteristic of the device, was also estimated in this study. The calibration factors of the survey meter were calculated for (131)I, (132)I, (133)I, and (135)I content in the thyroid gland for six age groups of population: newborns; children aged 1 yr, 5 yr, 10 yr, 15 yr; and adults. A realistic scenario of direct thyroid measurements with an "extended" neck was used to calculate the calibration factors for newborns and one-year-olds. Uncertainties in the device calibration factors due to variability of the device scale coefficient, variability in thyroid mass and statistical uncertainty of Monte Carlo method were evaluated. Relative uncertainties in the calibration factor estimates were found to be from 0.06 for children aged 1 yr to 0.1 for 10-yr and 15-yr children. The positioning errors of the detector during measurements deviate mainly in one direction from the estimated calibration factors. Deviations of the device position from the proper geometry of measurements were found to lead to overestimation of the calibration factor by up to 24 percent for adults and up to 60 percent for 1-yr children. The results of this study improve the estimates of (131)I thyroidal content and, consequently, thyroid dose estimates that are derived from direct thyroid measurements performed in Belarus shortly after the Chernobyl accident.
Authors:
Arkady Khrutchinsky; Vladimir Drozdovitch; Semion Kutsen; Victor Minenko; Valeri Khrouch; Nickolas Luckyanov; Paul Voillequé; André Bouville
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2011-12-29
Journal Detail:
Title:  Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine     Volume:  70     ISSN:  1872-9800     ISO Abbreviation:  Appl Radiat Isot     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-02-21     Completed Date:  2012-07-18     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  9306253     Medline TA:  Appl Radiat Isot     Country:  England    
Other Details:
Languages:  eng     Pagination:  743-51     Citation Subset:  IM    
Copyright Information:
Copyright © 2012. Published by Elsevier Ltd.
Affiliation:
Research Institute for Nuclear Problems, 11 Bobruiskaya Street, Minsk 220030, Belarus.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Child
Equipment and Supplies / standards
Humans
Infant
Models, Biological
Monte Carlo Method*
Radioactivity
Radiometry / instrumentation*
Thyroid Gland / chemistry*
Grant Support
ID/Acronym/Agency:
Z99 CA999999/CA/NCI NIH HHS
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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