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セメント固化体及び焼却灰試料の放射化学分析と標準試料の作製

Analysis of cement solidified product and ash samples and preparation of a reference material

石森 健一郎 ; 原賀 智子   ; 島田 亜佐子 ; 亀尾 裕 ; 高橋 邦明 

Ishimori, Kenichiro; Haraga, Tomoko; Shimada, Asako; Kameo, Yutaka; Takahashi, Kuniaki

これまでに放射性廃棄物に含まれる放射性核種の簡易かつ迅速な分析法を開発し、その方法を用いて模擬溶融固化体や実金属廃棄物試料などを分析することにより適用性を検証した後、その成果を分析指針としてまとめている。本検討では、この分析指針に示した分析法を用いてセメント固化体及び焼却灰試料を分析し、これらの廃棄物試料を分析する際の課題の抽出と分析法の改良を行った。焼却灰試料は放射能濃度が比較的高かったため、汚染防止を考慮した試料の粉砕・均一化について検討し、また焼却灰及びセメント固化体のCa含有量が多いことを考慮した試料溶解操作フローを作成した。さらに、これらの廃棄物試料に適用するための反応セル型質量分析装置を用いた$$^{129}$$I迅速分析法を開発した。分析指針に基づく核種分析試験では、事前に実施した$$gamma$$線核種分析($$^{60}$$Co,$$^{137}$$Cs)から他の$$alpha$$$$cdot$$$$beta$$線放出核種の放射能濃度を推定し、検出可能と予想された$$^{3}$$H,$$^{14}$$C,$$^{36}$$Cl,$$^{63}$$Ni,$$^{90}$$Sr及び$$alpha$$核種を中心に分析を行い、適用した分析法の有効性を確認した。

Simple and rapid analytical methods for radionuclides in low-level radioactive waste have been developed by the present authors. The methods were applied to simulated solidified products and actual metal wastes to confirm their usefulness. The results were summarized as analytical guide lines. In the present work, cement solidified products and ash wastes were analyzed followed by the analytical guide lines and subjects were picked up and improved for the application of the analytical guide lines to these wastes. Pulverization and homogenization methods for ash wastes were improved to prevent a contamination since the radioactivity concentrations of the ash wastes were relatively high. Pre-treatment method was altered for the ash wastes and cement solidified products taking account for their high composition of Ca. Newly, an analytical method was also developed to measure $$^{129}$$I with a dynamic reaction cell inductively coupled plasma mass spectrometer. In the analytical test based on the guide lines, $$gamma$$-ray emitting nuclides, $$^{60}$$CoCo and $$^{137}$$CoCs, were measured to estimate the radioactivity of the other alpha and $$beta$$-ray emitting nuclides. The radionuclides assumed detectable, $$^{3}$$H,$$^{14}$$C,$$^{36}$$Cl,$$^{63}$$Ni,$$^{90}$$Sr, and $$alpha$$-ray emitting nuclides, were analyzed with the analytical guide lines and their applicability for ash wastes and cement solidified products were confirmed.

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