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Report No.

Trend of $$^{137}$$Cs concentration in river water in the medium term and future following the Fukushima Nuclear accident

Nakanishi, Takahiro; Sakuma, Kazuyuki

We conducted a three-year-long observation (April 2015 - March 2018) of the $$^{137}$$Cs concentration in two rivers affected by the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. The result revealed a declining trend for the dissolved and particulate $$^{137}$$Cs concentration in river water in the medium term after the FDNPP accident. The dissolved and particulate $$^{137}$$Cs concentrations showed declining trends with time, even though large seasonal variations related to water temperature were also observed in the dissolved $$^{137}$$Cs concentrations. The environmental half-life for the dissolved $$^{137}$$Cs concentration was longer than previous reported values in the early phase, suggesting that the declining trend for the dissolved $$^{137}$$Cs concentration is gradually decreasing with time. The temperature dependency of the dissolved $$^{137}$$Cs concentration became weaker year by year, and the dissolved $$^{137}$$Cs concentration will likely remain at the same level for several decades.



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Category:Environmental Sciences



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