글로벌 연구동향
방사선방호 및 안전
- 2021년 06월호
[Health Phys.] Intake Ratio of 131I to 137CS Derived from Thyroid and Whole-body Doses to Residents of Iwaki City in Japan’s Fukushima Prefecture 일본 후쿠시마현 이와기시 거주자의 갑상선 및 전신 선량으로부터 유도된 I-131과 Cs-137의 섭취비율일본QRST / 김은주, Osamu Kurihara*
- 출처
- Health Phys.
- 등재일
- 2021 Apr 1
- 저널이슈번호
- 120(4):387-399. doi: 10.1097/HP.0000000000001345.
- 내용
Abstract
It is very important to determine the precise internal thyroid doses of Fukushima residents involved in the 2011 Fukushima nuclear disaster, particularly for small children. This has been challenging due to the lack of direct human measurements to identify 131I, the biggest contributor to the thyroid doses. We previously used a dataset of late whole-body counter (WBC) measurements targeting 134Cs and 137Cs for the thyroid dose estimation in comparison with the intake ratios of 131I to 137Cs (or 134Cs) derived from thyroid and whole-body doses individually obtained from different subject groups, assuming simultaneous acute intake via inhalation. Herein, we applied the same method to the doses of residents in Iwaki city (located south of the Fukushima Daiichi Nuclear Power Plant) with a relatively high activity ratio (131I/137Cs) for the ground deposition density. Our analyses revealed that the intake ratio (131I/137Cs) for the Iwaki residents was 4.2-4.3, which is relatively consistent with the values obtained in other studies (average 3.0-5.0). No regional difference in the intake ratios from other areas was observed, but further studies are required to determine the accurate intake ratio in the early phase of the accident, in particular focusing on the reasonable interpretation of results of the late WBC measurements to evaluate the actual Cs intake.Affiliation
Eunjoo Kim 1 , Kazuaki Yajima 1 , Yu Igarashi, Kotaro Tani 1 , Shozo Hashimoto 1 , Takashi Nakano 1 , Makoto Akashi, Osamu Kurihara 1
1 National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan.
- 덧글달기
- 이전글 [Occup Environ Med.] Occupational radiation exposure and cancer incidence in a cohort of diagnostic medical radiation workers in South Korea
- 다음글 [Appl Radiat Isot.] Simultaneous quantitative analysis of 3 H and 14 C radionuclides in aqueous samples via artificial neural network with a liquid scintillation counter