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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.

Language

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English

Journal

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Chemosphere

Volume

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215

Number

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Pages

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p.272 - 279

Publication Year/Month

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2019/01

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Patent information

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Paper URL

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https://doi.org/10.1016/j.chemosphere.2018.10.017

DOI for research data

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Link to research data related to this paper/report.

Keywords

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放射性セシウム; 福島第一原子力発電所事故; 河川水; 時間変化; Fukushima Daiichi Nuclear Power Station Accident

Research Facility

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Press Release

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河川のセシウム濃度、減少続く; 過去3年にわたる連続的な調査結果から

Article of JAEA R&D Review

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Observed Decrease of Radiocesium in River Water; Result of Three-Year-Long Observation[/]

Cooperating Institute

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Accesses

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- Accesses

InCites™

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Percentile:87.10

Category:Environmental Sciences

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