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オフサイトの核種分布特性に基づくサイト内環境中の核種インベントリの推定,4; 樹木における放射性核種分布の経年変化と樹種との関連性

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

新里 忠史  ; 佐々木 祥人 ; 難波 謙二*; 塚田 祥文*; Vasyl, Y.*

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

プルーム軌跡上のオフサイト2方向(1Fから南及び南西側)で採取した樹木及び土壌の放射能分析から樹木の$$^{137}$$Cs面移行係数を求め、プルーム及び樹種別の汚染状況を評価した。その結果、アカマツには明瞭な差異がないものの、スギはプルームにより面移行係数が大きく変化することが明らかとなった。

We determined the $$^{137}$$Cs aggregated transfer coefficients for trees from the $$^{137}$$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.

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