Study of Cs-137 Dispersion by the Fukushima Nuclear Power Plant Accident through Radioactivity Analysis of Mosses

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The dispersion of Cs-137 by the Fukushima Daiichi Nuclear Power Plant accident (Fukushima accident)was studied through a radioactivity analysis of more than 120 samples of mosses. Moss is a plant that grows abundantly any area of Japan. It was reconfirmed that mosses have an extremely higher ability to retain Cs-137 than other plants. The reason is considered to be that the moss absorbs Cs-137 in rainwater directly into the body not through the rhizoids from the soil. The difference in Cs-137 retention between different types of mosses is small. It is also easy to estimate the fallout value as the Cs-137 deposition in a unit of Bq/m2 because the moss forms two-dimensional colony. Mosses around eastern Fukushima Prefecture were collected and their radioactivity was analyzed. It was revealed that the radioactivity analysis of mosses is useful for obtaining the map of Cs-137 deposition transported from the nuclear power plant. The Cs-137 deposition map supports the estimation that the plume from the Fukushima Nuclear Power Plant transported to the Koriyama City via the Kawauchi Village in the morning of March 15, 2011, and transported again to the Koriyama City via the Iitate Village and the Fukushima City in the afternoon.

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  • 人間教育

    人間教育 1 (7), 171-184, 2018-09

    奈良学園大学人間教育学部

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