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Behavior of radiocesium at sediment-water interface off Fukushima

Otosaka, Shigeyoshi  ; Fukuda, Miho*; Aono, Tatsuo*

Behavior of dissolved radiocesium near the seafloor is discussed from the distributions of $$^{137}$$Cs in overlying water (seawater collected from $$sim$$30 cm above the seabed) at 14 stations and in pore water at 3 stations off Fukushima (1$$sim$$70 km from Fukushima Daiichi Nuclear Power Plant). The $$^{137}$$Cs concentrations in overlying water, collected during 2015 and 2016, ranged between 5 and 283 mBq/L. The $$^{137}$$Cs concentrations in overlying water were 2$$sim$$3 times higher than those in seawater collected from intermediate (5 m above the bottom) layers. The $$^{137}$$Cs concentrations in pore water were 10$$sim$$30 times higher than those in overlying water. We can consider that radiocesium is dissolved in the overlying water and has been diffused from the seabed through the porewater. Nevertheless, it was estimated that the amount of $$^{137}$$Cs transferred from porewater to benthic organisms does not lead to $$^{137}$$Cs activities exceeding the regulation limits at most stations.

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