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JAEAにおける環境汚染の修復に向けた除染技術の取組; 除染モデル実証事業の成果; 除染技術,2; 森林,農地等

JAEA's technical activities for environmental remediation of Fukushima; Decontamination pilot project; Result of environmental remediation by using various removal methods, 2 Forest and farmland

操上 広志  ; 森 英治; 北野 光昭

Kurikami, Hiroshi; Mori, Hideharu; Kitano, Mitsuaki

本報告では、除染モデル実証事業における、森林, 農地等の除染の概要について説明する。森林の除染の結果、落葉の除去だけでは除染効果はほとんど認められなかったが、腐植土までを除去した場合、線量率の明確な低下が認められた。農地に対する除染においては、汚染レベルに応じて撹拌耕, 反転耕, 天地返し, 表土剥ぎを適用した。天地返し及び表土剥ぎは線量低減の観点からは効果が大きかったが、表土剥ぎでは除去土壌等の発生が多大となった。

This paper shows the outcomes of decontamination of forest and farmland in the decontamination pilot project. For forest, removal of fallen leaves was not effective, while removal of humus resulted in obvious decrease of dose rate at the surface. In farmland, stirring/dilution, reversal tillage, turning-over and removal of surface soil were applied according to the contamination level. Turning-over and removal of surface soil were much more effective than the other techniques in the viewpoint of dose rate decrease, but removal of surface soil produced much more stuff.

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