标题：Migration and Accumulation of Radioactive Cesium in the Upstream Region of River Watersheds Affected by theFukushima Daiichi Nuclear Power Plant Accident: A Review
摘要：Huge amounts of radioactive cesium (Cs) were released by the accident at the Fukushima Daiichi Nuclear Power Plant into the environment and widely contaminated the Tohoku and Kanto regions, especially mountainous area of Fukushima Prefecture. Much research on the migration and accumulation of radioactive Cs in the heavily contaminated upstream region mainly consisting of forested catchments and water bodies has been conducted to understand the current status and process of the contamination from the Fukushima accident. This paper organizes the scientific knowledge about the migration and accumulation of deposited radioactive Cs in contaminated upstream regions after the Fukushima accident, especially regarding the runoff characteristics from forest catchments, accumulation characteristics in bottom sediment of dam reservoirs and ponds, and the behavior of bioavailable radioactive Cs. It then highlights future research issues for providing local residents safe and secure lives based on the above knowledge.
关键词：bioavailable radioactive Cs; dam reservoir; forest; irrigation pond; recontamination
