[2C01-09] Fukushima 1

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[2C07] Investigation on distribution of radioactive substances in Fukushima(2) Long-term changes in the depth distribution and downward migration of 137Cs in forest soils

*Junko Takahashi¹, Shunsuke Mishima¹, Yuichi Onda¹ (1. Univ. of Tsukuba)

Keywords:

Migration rate,Scraper plate,Long-term monitoring

After the Fukushima Daiichi Nuclear Power Plant accident, it is reported that Cs-137 migration from the forest litter layer to the soil surface layer is faster than in forests affected by the Chernobyl accident. However, regarding the downward migration of Cs-137 within mineral soil, the difference from Chernobyl and the difference by soil type are still unclear. In this study, we summarize the results of the Cs-137 depth distribution survey and discuss the difference in the migration rate and soil type.