中性子捕獲即発ガンマ線分析装置の開発と元素分析の基礎的検討

概要

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A highly sensitive neutron-induced prompt γ-ray analysis, (PGA) system, usable at both the cold-and thermal-neutron beam guides of the JRR -3M, was constructed in order to investigate non-destructive element analysis. The PGA system was designed to achieve the lowest γ-ray background by using lithium fluoride tiles as neutron shielding, placing the sample in a He atmosphere and using a Ge-BGO detector system for Compton suppression. Due to the low-energy guided neutron beams and the low -background system, the analytical sensitivities and detection limits are better than those in the conventional PGA systems. A basic examination of element analysis by PGA using the developed system has been completed. The determinations of B and multi-elements for H, C, N, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Mn, Fe, Co, Cd, Sm, Gd and Hg by comparative standardization have been established. The accuracy, precision and detection limits of the PGA were evaluated by applications for various reference materials, such as graphite, coal, oil, geological, environmental and biological samples. The PGA has also been practically applied to determine ^<10>B in human tissues during boron neutron-capture therapy treatments and to determine multi-elements in environmental samples.
社団法人日本分析化学会の論文
1997-10-05