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

Author

Listed:
  • Koya Ogura

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Masahiro Hosoda

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
    Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Yuki Tamakuma

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
    Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Takahito Suzuki

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
    Present address: Fuji Electric Co., Ltd., 1 Fujimachi, Hino, Tokyo 191-8502, Japan.)

  • Ryohei Yamada

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
    Present address: Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33 Muramatsu, Tokai, Ibaraki 319-1194, Japan.)

  • Ryoju Negami

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Takakiyo Tsujiguchi

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Masaru Yamaguchi

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Yoshitaka Shiroma

    (Faculty of Education, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan)

  • Kazuki Iwaoka

    (National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-0024, Japan)

  • Naofumi Akata

    (Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Mayumi Shimizu

    (Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Ikuo Kashiwakura

    (Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

  • Shinji Tokonami

    (Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan)

Abstract

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.

Suggested Citation

  • Koya Ogura & Masahiro Hosoda & Yuki Tamakuma & Takahito Suzuki & Ryohei Yamada & Ryoju Negami & Takakiyo Tsujiguchi & Masaru Yamaguchi & Yoshitaka Shiroma & Kazuki Iwaoka & Naofumi Akata & Mayumi Shim, 2021. "Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture," IJERPH, MDPI, vol. 18(3), pages 1-16, January.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:3:p:978-:d:485543
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    References listed on IDEAS

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    1. Yoshitake Takebayashi & Yuliya Lyamzina & Yuriko Suzuki & Michio Murakami, 2017. "Risk Perception and Anxiety Regarding Radiation after the 2011 Fukushima Nuclear Power Plant Accident: A Systematic Qualitative Review," IJERPH, MDPI, vol. 14(11), pages 1-13, October.
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