[2A13-19] Environmental Radioactivity and Monitoring 3

[2A15] Investigation on distribution of radioactive substances in Fukushima

(15)Vertical distributions of Cs-137 and Cs-133 in forest roots

*Junko Takahashi¹, Takuya Sasaki, Satoshi Iguchi¹, Yuichi Onda¹ (1. Univ. of Tsukuba)

Keywords:FDNPP accident, Forest soil, Transfer factor

In order to predict the absorption amount of Cs-137 to tree products, we have measured the Cs-137 and Cs-133 concentrations in plant roots that were picked up from soil samples by scraper survey under the forests at Yamakiya, Fukushima Prefecture. As results of 2012, 2015 and 2017, the Cs-137 concentration of roots were increasing over time, and transfer factors (ratio of Cs-137 in root/ Cs-137 in soil) were also tended to be increasing with time and with depth.