Fig.1　Distribution of air dose rates along a cross section of the riverbed and depth distributions of radioactive cesium for the Ukedo River (near the bridge of JR Joban line)

※ The amount of deposited ¹³⁷Cs in the figures is displayed as the amount per 1 m² area and 1 cm depth.

● The following tendencies were observed for the Ukedo River, Fukushima Prefecture.

1. Flood channel where water reaches only at high water-level periods e.g. typhoon :　
   There are some places where radioactive cesium is easily deposited. But such places are limited.
2. Place where water reaches several times a year :
   Deposition and erosion of cesium are repeating. The deposited amount of cesium is typically low.
3. Place that are easily flooded :
   Radioactive cesium is scarcely deposited.
   ※ Similar tendency was observed for other river systems in eastern Fukushima Prefecture (Hamadori District)

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Reference

1. 鶴田忠彦, 新里忠史, 中西貴宏, 土肥輝美, 中間茂雄, 舟木泰智, 御園生敏治, 大山卓也, 操上広志, 林誠二, 齊藤宏, 北村哲浩, 飯島和毅(2017): 福島における放射性セシウムの環境動態研究の現状; 根拠となる科学的知見の明示をより意識した情報発信の一環として, JAEA-Review 2017-018, 86p. https://doi.org/10.11484/jaea-review-2017-018