Evaluation of labile Cs-137 in Fukushima rivers by diffusive gradients in thin films (DGT, 2; Examination in river basins

Tanaka, Takuro*; Saito, Takumi*; Toda, Kanako*; Fujiwara, Kenso ; Terashima, Motoki  ; Nakanishi, Takahiro   ; Kobayashi, Natsuko*; Tanoi, Keitaro*

Cs-137 dispersed by the Fukushima Daiichi Nuclear Power Plant accident deposited in Fukushima area, that are not decontaminated in mountainous areas, may migrate through river water to animals and plants. Most of Cs-137 in river are fixed in clay minerals, but there are some Cs that can be easily desorbed, named as labile components. It has been suggested that labile components affect the bioavailability of Cs-137. In this study, the labile Cs-137 was sampled in situ from upstream to downstream in several rivers of Fukushima using a passive sampler called diffusive gradients in thin films (DGT). Sampling was conducted at a different season in addition to the previous studies.