Application of laser based quick spectroscopy for elemental and isotope analysis of nuclear fuel materials

レーザー利用迅速分光法の核燃料物質組成、同位体分析への応用

若井田 育夫  ; 赤岡 克昭 ; 宮部 昌文   ; 音部 治幹  ; Khumaeni, A.; 加藤 政明

Wakaida, Ikuo; Akaoka, Katsuaki; Miyabe, Masabumi; Otobe, Haruyoshi; Khumaeni, A.; Kato, Masaaki

化学分析や中性子計測によらない次世代マイナーアクチノイド含有MOX燃料の迅速遠隔分析の実現を目指したレーザー迅速分析技術開発を実施し、未照射MOX燃料で性能を実証した。MOX試料の分光のためにグローブボックスをレーザー分光用に改良し、元素分析にはレーザー誘起発光分光法を、同位体分析にはアブレーション共鳴吸収法を適用した。その結果、元素分析では、MOX中のPuについて、相対誤差が5%以下、検出下限値が2,500ppmとなる定量分析を5分間の計測時間で実現した。MOX中Pu同位体比分析では、相対誤差1%未満、検出下限値が30ppmの定量分析を5分間の計測時間で実現することに成功した。

Research and development of laser based quick analysis without chemical analysis and neutron measurement for next-generation Minor Actinide containing MOX fuel has been carried out, and the basic performances by using un-irradiated MOX fuel were demonstrated. The remote diagnostic technique for simultaneous analysis of element and isotope ratio by the combination of Laser Induced Breakdown Spectroscopy and Laser Ablation Resonance Absorption Spectroscopy are developed, and specialized glove box with auto and remote arraignment system had re-constructed. For elemental analysis, detection limit of thousand ppm of Pu in MOX and the relative error under 5% have been successfully obtained within 5 min. operation. For isotope analysis, U and Pu isotopes have been observed separately and quantitative analysis was applied. Detection limit of several ten ppm for specified isotope in MOX sample and quantitative error under 1% have been accomplished within 5 min. operation.