Abstract
It has been 10 years since the accident at Fukushima Daiichi nuclear power plant in 2011. Large quantities of 131I, 134Cs, and 137Cs were released into the environment, and 80% of 137Cs still remains. In addition to the decrease by attenuation, the transfer of 137Cs to plants, animals, and humans is decreasing due to movement and changing fractions with elapsed time. The activity concentration of 137Cs in the atmosphere has decreased drastically, and the internal radiation dose due to inhalation is negligible. The activity concentration of 137Cs in agricultural plants is decreasing due to decontamination of soil, application of potassium, and lower levels in irrigation water. The activity concentration of 137Cs in wild animals is decreasing, and shows seasonal variation in wild boars. The activity concentration of 137Cs in offshore seawater has decreased to 0.01 Bq l-1. Therefore, the radiation dose is <1 mSv of the additional radiation dose.
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