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Factors affecting $$^{137}$$Cs concentrations in river water under base-flow conditions near the Fukushima Dai-ichi Nuclear Power Plant

福島第一原子力発電所周辺河川における$$^{137}$$C濃度の変動要因

中西 貴宏  ; 舟木 泰智 ; 佐久間 一幸  

Nakanishi, Takahiro; Funaki, Hironori; Sakuma, Kazuyuki

2017年から2018年にかけて福島第一原子力発電所周辺河川の$$^{137}$$Cs濃度を測定した結果、溶存態$$^{137}$$Cs濃度・懸濁態$$^{137}$$Cs濃度ともに流域の平均$$^{137}$$Cs沈着量と良い相関を示した。沈着量で規格化した$$^{137}$$Cs濃度は流域内の森林への沈着割合と負の相関を示し、現時点では森林からの流出は河川水の$$^{137}$$Cs濃度を高める要因でないことが示唆された。

To confirm factors affecting $$^{137}$$Cs concentration in river water after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident, this study conducted monthly observations of nine rivers near the FDNPP from April 2017 to March 2018 under base-flow conditions. The annual mean dissolved and particulate $$^{137}$$Cs concentrations correlated well with the mean $$^{137}$$Cs deposition in the catchment. The normalized $$^{137}$$Cs concentrations in both phases by dividing by the mean $$^{137}$$Cs deposition in the catchment showed significant negative correlations with the $$^{137}$$Cs deposition ratio for forests. The inflow from the downstream plain areas increased the $$^{137}$$Cs concentrations near the FDNPP.

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パーセンタイル:0.03

分野:Chemistry, Analytical

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