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Report No.

Distribution and transport processes of iodine-129 in seabed sediment off Fukushima

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

From August to November 2011, seabed sediments were collected from off Fukushima and Ibaraki prefectures and $$^{129}$$I concentration in the sediments was measured with accelerator mass spectrometry. $$^{129}$$I concentration in the surface sediment (0-1 cm layer) ranged between 0.045 and 0.48 mBq/kg-dry, and was several times higher than that in 2009. The activity ratio of $$^{129}$$I, considered to originates from the accident of Fukushima Daiichi NPP, over $$^{137}$$Cs in seabed sediment was higher than those in surface seawater. These results indicate that radioiodine was selectively adsorbed onto particles in the surface seawater or in the sediment-water interface, and accumulated in the seabed sediments.



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