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.

中文翻译：

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福岛县富冈镇返回居民的当地辐射暴露剂量水平

富冈町位于福岛第一核电站方圆 20 公里范围内。居民生活空间中放射性铯的辐射剂量率通过测量返回家园后的环境剂量率和环境样本进行评估。2018 年和 2019 年的平均环境剂量率为室内 0.15-0.18-μSv/h，室外为 0.23-0.26-μSv/h，2018 年和 2019 年的额外辐射剂量率分别为 1.4 mSv/y 和 1.1 mSv/y 2019. 来自住宅区地表土壤的环境剂量当量在 2018 年和 2019 年估计为 0.66 mSv/y 和 0.54 mSv/y。此外，当地食物的承诺有效剂量计算为 19-74 μSv/y 和 39 2018 年和 2019 年成人为 –100 μSv/y。