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Report No.
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Preferential accumulation of particulate radioiodine in shelf-edge sediment off Fukushima, Japan

Otosaka, Shigeyoshi ; Sato, Yuhi; Suzuki, Takashi; Kuwabara, Jun

Transport processes of biohilic radionuclides, derived from the accident of Fukushima Daiichi Nuclear Power Plant, are discussed from distribution of $$^{129}$$I in seabed sediment off Fukushima. Concentrations of $$^{129}$$I in the seabed sediment in 2011 ranged between 0.02 and 0.45 mBq/kg, and were generally higher in the coastal region. In January 2013, about two years after the accident, concentrations of $$^{129}$$I in the sediment surface slightly increased in the shelf-edge region (bottom depth: 200$$sim$$400 m), and such a trend was not observed for radiocesium. The preferential accumulation of $$^{129}$$I in the shelf-edge sediment was explained by lateral transport of sedimentary $$^{129}$$I from the coastal to shelf-edge regions. Considering the geochemical characteristics of iodine, it can be considered that particulate organic matter near the seabed efficiently carried $$^{129}$$I to the offshore.

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