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Direct isotope ratio analysis of individual uranium-plutonium mixed particles with various U/Pu ratios by thermal ionization mass spectrometry

表面電離質量分析法による様々なU/Pu比を有するウラン-プルトニウム混合粒子の非分離同位体比分析

鈴木 大輔; 江坂 文孝; 宮本 ユタカ; 間柄 正明

Suzuki, Daisuke; Esaka, Fumitaka; Miyamoto, Yutaka; Magara, Masaaki

化学分離を行わずに様々なU/Pu比を有する個々のU-Pu混合粒子中のU及びPuの同位体比分析を表面電離型質量分析計を用いた連続昇温法により行った。測定に先立ち、同位体標準物質CRM U-010 (NBL, 1%$$^{235}$$U濃縮)及びSRM 947(NBS)溶液を用いて、U/Pu比が1, 5, 10, 18及び70の直径がマイクロメートルサイズのU-Pu混合粒子を作製した。分析の結果、測定した全粒子において、$$^{238}$$Pu/$$^{239}$$Pu比を除くU及びPuの全ての同位体比で正確な値が得られた。本結果から、$$^{238}$$Pu/$$^{239}$$Pu比を正確に測定するには化学分離などの前段化学処理が必要とされるものの、本分析技術は保障措置及び核鑑識分析において効果的な手段になり得ることが示された。

Isotope ratios of uranium and plutonium in individual U-Pu mixed particles with various U/Pu ratios were determined by thermal ionization mass spectrometry with a continuous heating method without chemical separation. Prior to the measurements, micron-sized U-Pu mixed particles with U/Pu ratios of 1, 5, 10, 18 and 70 were produced by using certified reference materials CRM U-010 (1%$$^{235}$$U enriched, NBL) and SRM 947 (NBS) solutions. As a result of isotope ratio analysis, accurate values for U and Pu ratios, except for $$^{238}$$Pu/$$^{239}$$Pu, were successfully determined for the particles with all U/Pu ratios. Although some pre-treatment such as chemical separation would need for accurate determination of $$^{238}$$Pu/$$^{239}$$Pu isotope analysis, it was shown that this analytical technique has a potential of powerful tool for nuclear safeguards and forensics.

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パーセンタイル:12.68

分野:Chemistry, Inorganic & Nuclear

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