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$$^{137}$$Cs vertical migration in a deciduous forest soil following the Fukushima Dai-ichi Nuclear Power Plant accident

Nakanishi, Takahiro  ; Matsunaga, Takeshi; Koarashi, Jun  ; Atarashi-Andoh, Mariko 

To investigate $$^{137}$$Cs mobility deposited on the forest floor because of the Fukushima nuclear accident, we investigated the vertical migration of $$^{137}$$Cs through seepage water, using a lysimetric method. The study was conducted in a deciduous forest soil over a period spanning two months to two years after the accident. Our observations demonstrated that the major part of $$^{137}$$Cs in the litter layer moved into the mineral soil within one year after the accident. The topsoil prevented migration of $$^{137}$$Cs and the annual migration below a 10 cm depth accounted for 0.1% of the total $$^{137}$$Cs inventory. The migration of $$^{137}$$Cs by seepage water was undetectable from the vertical distribution of $$^{137}$$Cs inventory in the soil profile. In the present and immediate future, most of the $$^{137}$$Cs deposited on the forest floor will probably remain in the topsoil successively, although a small but certain amount of bioavailable $$^{137}$$Cs exists in forest surface soil.

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