Understanding of the behavior of radioactive cesium in front of rivers during typhoons

Misono, Toshiharu   ; Tsuruta, Tadahiko  ; Nakanishi, Takahiro   

Radioactive cesium was released into the environment and deposited extensively by the accident of Fukushima Daiichi Nuclear Power Plant. In the coastal area, it is necessary to understand the behavior of radioactive cesium supplied with the suspended solids from the river at the time of typhoon. In this study, sediment trap system and a water quality system, were installed in front of major rivers on the coast of Fukushima Prefecture, and sinking particles and water quality data were collected continuously. As a result, it was suggested that most of the radioactive cesium settled in front of the river, and the supply of radioactive cesium to the offshore was limited.