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研究施設等廃棄物に含まれる$$^{59}$$Ni及び$$^{63}$$Niの分析法

Analytical method for $$^{59}$$Ni and $$^{63}$$Ni in low-level radioactive wastes arising from nuclear research facilities

亀尾 裕; 原賀 智子; 片山 淳; 星 亜紀子; 中島 幹雄

Kameo, Yutaka; Haraga, Tomoko; Katayama, Atsushi; Hoshi, Akiko; Nakashima, Mikio

放射性廃棄物を対象としたルーチン分析法のひとつとして、$$^{59}$$Ni及び$$^{63}$$Niの分析法について検討を行った。分析試料の核種組成や化学成分を考慮して分離条件の最適化を図った結果、金属廃棄物試料及び濃縮廃液試料に含まれる$$^{59}$$Ni及び$$^{63}$$Niの放射能濃度を効率よく定量することができた。金属廃棄物試料について、本法による分析値と放射化計算による予測値との比較を行った結果、両者はよく一致することがわかった。

A routine analytical method was developed for the determination of $$^{59}$$Ni and $$^{63}$$Ni in low-level radioactive wastes arising from nuclear research facilities. A separation scheme of $$^{59}$$Ni and $$^{63}$$Ni in waste samples was optimized by considering concentration of interference radionuclides and chemical composition of the waste samples. Concentrations of $$^{59}$$Ni and $$^{63}$$Ni in actual radioactive wastes such as pipes and liquid waste could be well determined by the present analytical method. In the determination, the time required for the chemical separation was five to seven days per ten samples. It was concluded that the present method could be applied to a routine determination of $$^{59}$$Ni and $$^{63}$$Ni in low-level radioactive wastes. In the present experiment, radioactivity ratio of $$^{63}$$Ni/$$^{59}$$Ni in pipe samples, which were taken from a nuclear research reactor, was estimated by a computer code (ORIGEN2). Radioactivity ratio of $$^{63}$$Ni/$$^{59}$$Ni, obtained by the computer calculation, was ranged from 98 to 109 and that obtained by the present analytical method was 118 $$pm$$ 6.

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