埋設処分対象の低レベル放射性廃棄物に由来する放射性炭素の水稲による経根吸収 (2):―酢酸を放射性炭素の起源とした場合の植物体中分布―

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The behavior of 14C from radioactive waste in paddy rice (Oryza sativa L.) at different stages of plant development was studied using the hydroponic and acetic acid as 14C-source. For 14C-application, plant root was soaked for 2 hours in a nutrient solution containing 14C-acetic acid at the vegetative growth stage (Aug. 2, 2007), heading (flowering) stage (Aug. 30, 2007) and milk-ripe stage (Sep. 13, 2007). In final sampling day (Mar. 5, 2008), 0.88-1.96% of the applied radioactivity was recovered from whole plant, however, the ratio of recovered radioactivity was not different at the growth stage. The distribution of 14C absorbed at each stage to each organ was noted to be highest in the submersed root through all the stages. Therefore the mixing of the root residue at the time of plowing would result in enhancement of the soil persistence of 14C.
日本保健物理学会の論文