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Whole-body counting of Fukushima residents after the TEPCO Fukushima Daiichi Nuclear Power Station accident

Abstract

At the request of the Fukushima government, the Japan Atomic Energy Agency (JAEA) started whole-body counting of residents on July 11, 2011, to assess radiation exposure after the TEPCO Fukushima Daiichi Nuclear Power Station accident. JAEA has examined residents in Iitate, Kawamata, Namie, and eight other local communities. The measurement capacity of the whole-body counting device is approximately 100 persons per day, and the total number of people to measure reached 9,927 by the end of January 2012. Two types of whole-body counter (WBC), each of which has two large-sized NaI(Tl) detectors, were used to perform the measurements. Physical phantoms (a Canberra RMC-II transfer phantom or a water-filled block phantom developed by JAEA) were used to perform the efficiency calibration of the WBCs, and results of this calibration were verified by comparing them with different-sized BOttle Mannequin ABsorber (BOMAB) phantoms imitating an adult male, a 10-year-old child, and a 4-year-old child. Short half-life radionuclides (e.g., {sup 131}I) originating from the accident were not detected in the present work, because the measurements were made starting four months after the accident. These measurements showed that about 80% of the residents were below a minimum detectable amount (MDA) of the measured radionuclides in  More>>
Authors:
Momose, Takumaro; Takada, Chie; Nakagawa, Takahiro; Nakai, Katsuta; Kurihara, Osamu; Tsujimura, Norio; Furuta, Sadaaki; [1]  Ohi, Yoshihiro; Murayama, Takashi; Suzuki, Takashi; [2]  Uezu, Yasuhiro [3] 
  1. Japan Atomic Energy Agency, Nuclear Fuel Cycle Engineering Laboratories, Tokai, Ibaraki (Japan)
  2. Japan Atomic Energy Agency, Nuclear Science Research Institute, Tokai, Ibaraki (Japan)
  3. Japan Atomic Energy Agency, Fukushima Environmental Safety Center, Fukushima, Fukushima (Japan)
Publication Date:
Nov 15, 2012
Product Type:
Conference
Report Number:
NIRS-M-252
Resource Relation:
Conference: 1. NIRS symposium on reconstruction of early internal dose in the TEPCO Fukushima Daiichi Nuclear Power Station accident, Chiba (Japan), 10-11 Jul 2012; Other Information: 10 refs., 9 figs., 6 tabs.; Related Information: In: The 1st NIRS symposium on reconstruction of early internal dose in the TEPCO Fukushima Daiichi Nuclear Power Station accident. Proceedings| by Kurihara, Osamu; Akahane, Keiichi; Fukuda, Shigekazu; Miyahara, Nobuyuki; Yonai, Shunsuke (eds.)| 231 p.
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ADULTS; CESIUM 134; CESIUM 137; CHILDREN; EXCEPTIONAL NATURAL DISASTER; FUKUSHIMA-1 REACTOR; FUKUSHIMA-2 REACTOR; FUKUSHIMA-3 REACTOR; FUKUSHIMA-4 REACTOR; PERSONNEL DOSIMETRY; RADIATION PROTECTION; RADIOACTIVE MATERIALS; REACTOR ACCIDENTS; WHOLE-BODY COUNTING
OSTI ID:
22163895
Research Organizations:
National Inst. of Radiological Sciences, Chiba (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
TRN: JP1304322118329
Availability:
Available from the Internet at URL http://repo.nirs.go.jp/dspace/bitstream/918273645/330/1/nirs_m_252.pdf
Submitting Site:
INIS
Size:
page(s) 67-82
Announcement Date:
Nov 28, 2013

Citation Formats

Momose, Takumaro, Takada, Chie, Nakagawa, Takahiro, Nakai, Katsuta, Kurihara, Osamu, Tsujimura, Norio, Furuta, Sadaaki, Ohi, Yoshihiro, Murayama, Takashi, Suzuki, Takashi, and Uezu, Yasuhiro. Whole-body counting of Fukushima residents after the TEPCO Fukushima Daiichi Nuclear Power Station accident. Japan: N. p., 2012. Web.
Momose, Takumaro, Takada, Chie, Nakagawa, Takahiro, Nakai, Katsuta, Kurihara, Osamu, Tsujimura, Norio, Furuta, Sadaaki, Ohi, Yoshihiro, Murayama, Takashi, Suzuki, Takashi, & Uezu, Yasuhiro. Whole-body counting of Fukushima residents after the TEPCO Fukushima Daiichi Nuclear Power Station accident. Japan.
Momose, Takumaro, Takada, Chie, Nakagawa, Takahiro, Nakai, Katsuta, Kurihara, Osamu, Tsujimura, Norio, Furuta, Sadaaki, Ohi, Yoshihiro, Murayama, Takashi, Suzuki, Takashi, and Uezu, Yasuhiro. 2012. "Whole-body counting of Fukushima residents after the TEPCO Fukushima Daiichi Nuclear Power Station accident." Japan.
@misc{etde_22163895,
title = {Whole-body counting of Fukushima residents after the TEPCO Fukushima Daiichi Nuclear Power Station accident}
author = {Momose, Takumaro, Takada, Chie, Nakagawa, Takahiro, Nakai, Katsuta, Kurihara, Osamu, Tsujimura, Norio, Furuta, Sadaaki, Ohi, Yoshihiro, Murayama, Takashi, Suzuki, Takashi, and Uezu, Yasuhiro}
abstractNote = {At the request of the Fukushima government, the Japan Atomic Energy Agency (JAEA) started whole-body counting of residents on July 11, 2011, to assess radiation exposure after the TEPCO Fukushima Daiichi Nuclear Power Station accident. JAEA has examined residents in Iitate, Kawamata, Namie, and eight other local communities. The measurement capacity of the whole-body counting device is approximately 100 persons per day, and the total number of people to measure reached 9,927 by the end of January 2012. Two types of whole-body counter (WBC), each of which has two large-sized NaI(Tl) detectors, were used to perform the measurements. Physical phantoms (a Canberra RMC-II transfer phantom or a water-filled block phantom developed by JAEA) were used to perform the efficiency calibration of the WBCs, and results of this calibration were verified by comparing them with different-sized BOttle Mannequin ABsorber (BOMAB) phantoms imitating an adult male, a 10-year-old child, and a 4-year-old child. Short half-life radionuclides (e.g., {sup 131}I) originating from the accident were not detected in the present work, because the measurements were made starting four months after the accident. These measurements showed that about 80% of the residents were below a minimum detectable amount (MDA) of the measured radionuclides in the whole-body content. No artificial nuclides other than {sup 134}Cs and {sup 137}Cs were detected in the present whole-body counting. The maximum whole-body content of radiocesium ({sup 134}Cs and {sup 137}Cs in total) was 2.7 kBq for children (< 8 years old) and 14 kBq for adults. The radioactivity ratio ({sup 137}Cs/{sup 134}Cs) was estimated to be from 1.12 to 1.26. An acute intake scenario via inhalation of radiocesium was assumed in the present dose estimation for all the residents who were measured by the end of January 2012. The committed effective dose (CED) to 99.8% of the residents was found to be below 1 mSv. There were only 25 subjects with a CED greater than 1 mSv, and the maximum CED recorded was 3 mSv. The extrapolated 50th percentile (median) values of the CED for two age groups of 13-17 years old and > 17 years old were 0.02 mSv and 0.025 mSv, respectively. These values provide useful information for the dose reconstruction of early internal exposure to all of the residents in affected areas. (author)}
place = {Japan}
year = {2012}
month = {Nov}
}