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Estimation of counting efficiencies of a portable Nal detector using Monte Carlo simulation for thyroid measurement following nuclear accidents

Title
Estimation of counting efficiencies of a portable Nal detector using Monte Carlo simulation for thyroid measurement following nuclear accidents
Author
김종경
Keywords
counting efficiency; NaI detector; Monte Carlo simulation; thyroid measurement; internal contamination
Issue Date
2017-09
Publisher
IOP PUBLISHING LTD
Citation
JOURNAL OF RADIOLOGICAL PROTECTION, v. 37, no. 3, page. 635-641
Abstract
Radioiodine can be released in nuclear accidents and can cause internal contamination of the thyroid gland in members of the public. For population monitoring in radiation emergencies, measurement of counting efficiency is very important to accurately determine thyroid activity. Here, we estimate the counting efficiencies of a portable NaI detector using Monte Carlo simulations. Two different types of neck phantoms and a 7.62 cm long by 7.62 cm diameter NaI detector were modeled and the counting efficiencies were calculated depending on the thyroid size and distance from the neck phantom to the detector. We found that distance is a more important parameter than thyroid size. The optimal distance of the NaI detector from the neck surface was determined to be greater than 12 cm, beyond which the counting efficiency was not affected by thyroid size.
URI
https://iopscience.iop.org/article/10.1088/1361-6498/aa714dhttps://repository.hanyang.ac.kr/handle/20.500.11754/115469
ISSN
0952-4746; 1361-6498
DOI
10.1088/1361-6498/aa714d
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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