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Simple method for C-14 analysis in organic material and its distribution in forest and cultivated field

有機物中C-14簡易測定法の開発と森林、耕作地土壌中C-14分布

安藤 麻里子 ; 天野 光

Atarashi-Andoh, Mariko; Amano, Hikaru

フォールアウト起源C-14の現在の環境中での分布を調べ、炭素循環挙動を調べるために、有機物中C-14の簡易測定方法を開発した。植物及び土壌サンプルを爆発燃焼し、放出したCO$$_{2}$$を液体窒素を用いたコールドトラップで捕集し、カーボソーブを用いたCO$$_{2}$$吸収法によって測定した。東海村で採取した松葉を用いてベンゼン合成法、AMS測定法とクロスチェックを行い、結果はよく一致した。この方法を用いて、森林及び水田で採取した、植物及び土壌中のC-14比放射能を測定し、フォールアウト起源のC-14の挙動及び、炭素循環について考察した。

Because of the long radioactive half-life of C-14, fallout C-14 from former nuclear weapon-tests still remains in soil, and there is a C-14 flux from the soil surface to the atmosphere [1]. Patterns of C-14 enrichment in soil profiles provide important information for estimating carbon turnover and carbon flux from soil. A simple analytical method of C-14 measurement has been developed for measuring C-14 distribution in the terrestrial environment. C-14 specific activities in plants and soils in a forest and a cultivated field were measured by this method. The data were made available to assess the behavior of fallout C-14 in the surface environment.

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