Estimation of on-site radionuclides inventories of Fukushima Daiichi NPS based on their off-site distribution, 4; Secular changes of radionuclides distribution and its relationship to tree type

Niizato, Tadafumi  ; Sasaki, Yoshito ; Namba, Kenji*; Tsukada, Hirofumi*; Vasyl, Y.*

We determined the Cs aggregated transfer coefficients for trees from the Cs activities of tree organs and soil layers collected in the off-site localities on the path of the radioactive plumes (southern and southwestern plume), and assessed the contamination status of each tree type. As a result, it was revealed that although the Japanese red pine has no distinct difference, but the Japanese cedar has a large change in aggregated transfer coefficients due to the plume.