[2F14-16] Environmental Radioactivity

[2F14] Evaluation of labile ¹³⁷Cs in rivers in Fukushima prefecture by diffusive gradients in thin films (DGT)

(2)Examination in river basins

*Takuro Tanaka¹, Takumi Saito¹, Kanako Toda¹, Kenso Fujiwara², Motoki Terashima², Takahiro Nakanishi², Natsuko I Kobayashi¹, Keitaro Tanoi¹ (1. UTokyo, 2. JAEA)

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

¹³⁷Cs 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 ¹³⁷Cs 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 ¹³⁷Cs. In this study, the labile ¹³⁷Cs 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.