[3M05-08] Environmental Radioactivity & Radiation

[3M06] Evaluation of labile 137Cs in Fukushima rivers by diffusive gradients in thin films (DGT)

*Takuro Tanaka¹, Takumi Saito¹, Kenso Fujiwara², Motoki Terashima², Takahiro Nakanishi², Natsuko Kobayashi¹ (1. UTokyo, 2. JAEA)

Keywords:Diffusive gradients in thin films, Passive sampling, Labile Cesium, Suspended solid

There is a concern that ¹³⁷Cs which remains untouched in mountainous areas is taken up by plants and animals or discharged to the sea through rivers. Most of ¹³⁷Cs in river water are known to be fixed in clay minerals, but Cs ions bound to weathered edges of the minerals can be easily desorbed, contributing to the labile fraction of Cs and thus the bioavailability of ¹³⁷Cs. In this study, the labile ¹³⁷Cs was in situ sampled in rivers of Fukushima prefecture using a passive sampler called diffusive gradients in thin films (DGT). In the conference we will report the relationship of the labile fractions of ¹³⁷Cs with those of dissolved/suspended ¹³⁷Cs and the impacts of sampling locations.