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Report No.
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Resuspension and lateral transport of seafloor sediment contaminated with artificial radionuclides derived from Fukushima Daiichi Nuclear Power Plant accident

Honda, Makio*; Otosaka, Shigeyoshi 

Transport processes of particulate radiocesium obtained from a three year time-series sediment trap experiments at a site 115 km southeast of Fukushima Daiichi Nuclear Power Plant off Fukushima are expounded. Results show a high fraction of lithogenic material in sinking particles, suggesting a lateral source of sediments. In particular, we found that accident-derived radiocesium associate with slope and shelf sediments were resuspended and transported laterally to the offshore regions in typhoon seasons in 2013. Continuous observation of such transport processes of particulate radiocesium near the seabed would be significant for better understanding of the fate of accident-derived radiocesium.

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