Department of Global Health, Medicine and Welfare, Atomic Bomb Disease Institute, Nagasaki University, Graduate School of Biomedical Sciences, 1-12-4 Sakamoto, Nagasaki City, Nagasaki Prefecture 852-8523, Japan.
Radiat Prot Dosimetry. 2021 May 17;193(3-4):207-220. doi: 10.1093/rpd/ncab049.
Tomioka Town is located within a 20-km radius of the Fukushima Daiichi Nuclear Power Station. Radiation dose rates due to radiocesium in residents' living spaces were evaluated from the measurements of ambient dose rates and environmental samples after returning home. The mean ambient dose rates were 0.15-0.18-μSv/h indoors and 0.23-0.26-μSv/h outdoors during 2018 and 2019, and the additional radiation dose rates were calculated to be 1.4 mSv/y in 2018 and 1.1 mSv/y in 2019. Ambient dose equivalent from surface soils within housing sites were estimated to be 0.66 mSv/y in 2018 and 0.54 mSv/y in 2019. Moreover, committed effective doses from local foods were calculated in 19-74 μSv/y for children and 39-100 μSv/y for adults during 2018 and 2019. These findings suggest that current radiation exposure doses have been controlled at the levels close to the public dose limit (1 mSv/y) in residents' living spaces.
富冈町位于福岛第一核电站 20 公里半径范围内。从返回家园后的环境剂量率测量和环境样本中评估了居民生活空间中放射性铯引起的辐射剂量率。2018 年和 2019 年，室内平均环境剂量率为 0.15-0.18 μSv/h，室外为 0.23-0.26 μSv/h，计算得出 2018 年附加辐射剂量率为 1.4 mSv/y，2019 年为 1.1 mSv/y。2018 年和 2019 年，房屋场地内表层土壤的环境剂量当量估计分别为 0.66 mSv/y 和 0.54 mSv/y。此外，2018 年和 2019 年，当地食品对儿童的估算年有效剂量为 19-74 μSv/y，对成人的估算年有效剂量为 39-100 μSv/y。这些发现表明，目前居民生活空间的辐射暴露剂量已控制在接近公众剂量限值（1 mSv/y）的水平。
