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Open AccessArticle

Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture

1
Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
2
Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
3
Faculty of Education, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
4
National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-0024, Japan
*
Author to whom correspondence should be addressed.
Present address: Fuji Electric Co., Ltd., 1 Fujimachi, Hino, Tokyo 191-8502, Japan.
Present address: Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33 Muramatsu, Tokai, Ibaraki 319-1194, Japan.
Academic Editor: Paul B. Tchounwou
Int. J. Environ. Res. Public Health 2021, 18(3), 978; https://doi.org/10.3390/ijerph18030978
Received: 28 December 2020 / Revised: 17 January 2021 / Accepted: 18 January 2021 / Published: 22 January 2021
Ten years have elapsed since the accident at the Fukushima Daiichi Nuclear Power Plant in 2011, and the relative contribution of natural radiation is increasing in Fukushima Prefecture due to the reduced dose of artificial radiation. In order to accurately determine the effective dose of exposure to artificial radiation, it is necessary to evaluate the effective dose of natural as well as artificial components. In this study, we measured the gamma-ray pulse-height distribution over the accessible area of Namie Town, Fukushima Prefecture, and evaluated the annual effective dose of external exposure by distinguishing between natural and artificial radionuclides. The estimated median (range) of absorbed dose rates in air from artificial radionuclides as of 1 April 2020, is 133 (67–511) nGy h−1 in the evacuation order cancellation zone, and 1306 (892–2081) nGy h−1 in the difficult-to-return zone. The median annual effective doses of external exposures from natural and artificial radionuclides were found to be 0.19 and 0.40 mSv in the evacuation order cancellation zone, and 0.25 and 3.9 mSv in the difficult-to-return zone. The latest annual effective dose of external exposure discriminated into natural and artificial radionuclides is expected to be utilized for radiation risk communication. View Full-Text
Keywords: Fukushima Daiichi Nuclear Power Plant; Namie Town; natural radionuclides; artificial radionuclides; cesium-134; cesium-137; external exposure dose evaluation Fukushima Daiichi Nuclear Power Plant; Namie Town; natural radionuclides; artificial radionuclides; cesium-134; cesium-137; external exposure dose evaluation
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MDPI and ACS Style

Ogura, K.; Hosoda, M.; Tamakuma, Y.; Suzuki, T.; Yamada, R.; Negami, R.; Tsujiguchi, T.; Yamaguchi, M.; Shiroma, Y.; Iwaoka, K.; Akata, N.; Shimizu, M.; Kashiwakura, I.; Tokonami, S. Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture. Int. J. Environ. Res. Public Health 2021, 18, 978. https://doi.org/10.3390/ijerph18030978

AMA Style

Ogura K, Hosoda M, Tamakuma Y, Suzuki T, Yamada R, Negami R, Tsujiguchi T, Yamaguchi M, Shiroma Y, Iwaoka K, Akata N, Shimizu M, Kashiwakura I, Tokonami S. Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture. International Journal of Environmental Research and Public Health. 2021; 18(3):978. https://doi.org/10.3390/ijerph18030978

Chicago/Turabian Style

Ogura, Koya; Hosoda, Masahiro; Tamakuma, Yuki; Suzuki, Takahito; Yamada, Ryohei; Negami, Ryoju; Tsujiguchi, Takakiyo; Yamaguchi, Masaru; Shiroma, Yoshitaka; Iwaoka, Kazuki; Akata, Naofumi; Shimizu, Mayumi; Kashiwakura, Ikuo; Tokonami, Shinji. 2021. "Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture" Int. J. Environ. Res. Public Health 18, no. 3: 978. https://doi.org/10.3390/ijerph18030978

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