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Pb by combining activation method and high-precision thermal ionization mass spectrometry中村 詔司; 芝原 雄司*; 静間 俊行*; 木村 敦; 遠藤 駿典; Rovira Leveroni, G.
Journal of Nuclear Science and Technology, 9 Pages, 2026/00
被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)In view of the requirement for accurate cross-section data of the stable Pb isotopes in order to discuss the neutron moderation effect and neutron economy in the design of accelerator-driven systems, the authors previously derived the thermal-neutron capture cross-section of Pb by using thermal ionization mass spectrometry to be 0.537
0.030 barn. The uncertainty in the 
Pb/Pb isotope ratio determined by mass spectrometry was 4.3
, bringing the total uncertainty to 5.6. This study demonstrated that a new silica-gel emitter used in mass spectrometry improved isotope ratio precision to 1. This enabled us to determine the reaction rate with 1 accuracy, which exceeds the accuracy of conventional activation analysis. Owing to improved accuracy in mass spectrometry, the uncertainty has been reduced and the value of isotope ratio has changed slightly. Accordingly, the authors report a revised Pb neutron capture cross-section of 0.5120.019 barn.
峯尾 英章; 後藤 実; 飯塚 勝*; 藤崎 進; 萩谷 弘通*; 内山 軍蔵
Separation Science and Technology, 38(9), p.1981 - 2001, 2003/05
被引用回数：26 パーセンタイル：66.08(Chemistry, Multidisciplinary)銀シリカゲル(以下Ag-Sと略)カラム内のヨウ素-129分布を予測する数学モデルの適用性を44,000MWdt
までの燃焼度の使用済燃料の溶解時に発生する実際のオフガスを用い検討した。モデルによって予測されたヨウ素-129の分布は実験で得られた分布とよく一致した。このモデルは使用済燃料溶解時のオフガス処理のため423Kで運転されるAg-Sカラムにおけるヨウ素分布予測に有効であることが示唆された。また、この予測で用いた有効拡散係数やラングミュア係数の値は、オフガス中のNO
濃度が1%程度まで使用可能であると考えられた。
長沼 和希*; 松枝 誠; 柳澤 華代; 及川 博史*; 橋本 淳一*; 高貝 慶隆*
no journal, ,
In this study, the adsorption of niobium (Nb) on silica gel was investigated and the application to the Nb analysis was demonstrated. Here, a solution containing 67 elements was passed through a column packed with silica gel. The impact of acidic concentration (HCl or HNO
) and pH on the adsorption was investigated. Adsorption property was evaluated using inductively coupled plasma mass spectrometry and the efficiencies of adsorption and recovery processes were calculated. The element selectivity for Nb was very high, and the efficiency of adsorption was over 90% under strong acid conditions. Also the adsorbed Nb was successfully eluted from the silica gel column. The adsorption capacities on silica gels depended on the particle diameter and pore size of the adsorbent.
