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Transport behavior of radiocaesium through water system in the coastal area of Fukushima

Iijima, Kazuki  ; Funaki, Hironori ; Hagiwara, Hiroki  ; Nakanishi, Takahiro   ; Tsuruta, Tadahiko  

JAEA has carried out the project on the Long-term Assessment of Transport of Radioactive Contaminant in the Environment of Fukushima (F-TRACE project) since the end of 2012. Radiocaesium has been distributed by the fallout from the Fukushima Dai-ichi Nuclear Power Plant accident mainly to the coastal area of Fukushima Prefecture. In this project, the transport behavior of radiocaesium through water systems located in coastal areas of Fukushima was investigated to establish predictive modeling tools for distribution of radiocaesium and to estimate future effective dose of the residents. One of the study rivers in the coastal area was Ukedo River which was selected due to the high contamination of radiocaesium in the catchment especially upstream in contrast with less contamination downstream. This paper provides an overview of the results of field observations on the distribution and evolution of radiocaesium activity concentration in the Ukedo River water system carried out in 2013 and 2014. It can be concluded that the dam has a significant ability to constrain transport of radiocaesium from upstream to downstream.

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