Environmental Radiation Monitoring and External Dose Estimation in Aomori Prefecture after the Fukushima Daiichi Nuclear Power Plant Accident Management Division, Japan Nuclear Fuel Limited; 4-108 Aza

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  • HOSODA Masahiro
    Department of Radiological Life Sciences, Division of Medical Life Sciences, Hirosaki University Graduate School of Health Sciences
  • INOUE Kazumasa
    Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University
  • OKA Mitsuaki
    Environmental Radioactivity Monitoring Center, Safety Management Division, Japan Nuclear Fuel Limited
  • OMORI Yasutaka
    Department of Radiation Physics and Chemistry, Fukushima Medical University
  • IWAOKA Kazuki
    Department of Radiation Physics, Hirosaki University, Institute of Radiation Emergency Medicine
  • TOKONAMI Shinji
    Department of Radiation Physics, Hirosaki University, Institute of Radiation Emergency Medicine

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タイトル別名
  • Environmental Radiation Monitoring and External Dose Estimation in Aomori Prefecture after the Fukushima Daiichi Nuclear Power Plant Accident

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説明

Many nuclear facilities are located within Aomori Prefecture, Japan. However, no detailed dose rate distribution map of Aomori Prefecture, including its mountain regions has been reported since the Fukushima Daiichi Nuclear Power Plant accident. A car-borne survey which used a 3-in × 3-in NaI(Tl) scintillation spectrometer was carried out throughout the prefecture for the purposes of making a dose distribution map and estimating the annual external dose. The average absorbed dose rate in air and the annual effective dose were found to be 22 ± 5 nGy h-1 and 0.20 ± 0.08 mSv, respectively. These average values for all of Aomori Prefecture were respectively 44% and 59% of the nationwide average values. The average values with standard deviations of activity concentrations in soil of 40K, 238U and 232Th were 234 ± 148, 15 ± 6, 12 ± 6 Bq kg-1, respectively. The average values of contributions of 40K, 238U and 232Th to absorbed dose rates in air were 39%, 29% and 32%, respectively. The contributions of 134Cs and 137Cs to the absorbed dose rates in air were judged to be negligible.

収録刊行物

  • 保健物理

    保健物理 51 (1), 41-50, 2016

    日本保健物理学会

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