Abstract
Basic examination of elemental analysis by a reactor-neutron-induced prompt γ-ray analysis (PGA) using a system installed at the JRR-3M (upgraded Japan Research Reactor No. 3) cold and thermal neutron beam guides is reported. Analytical sensitivities and detection limits for 71 elements were measured. Boron, Gd, Sm, and Cd are the most sensitive elements with detection limits down to 1 to 7 ng. The decay γ-rays of some elements such as F, Al, V, Eu, and Hf have a higher analytical sensitivity compared to their respective prompt γ-rays. In addition, the analytical sensitivity of several heavy elements through detection of characteristic X-rays was higher than through the prompt y-ray detection. The present system is useful for the determination of, for example, ppb level of B in graphite and Be, ppb level of Gd, Sm, Eu, and Dy in high purity cerium(IV) oxide, and ppm to % level of H and Hf in Zr and zircaloy. This system is also applicable to trace determination of Cd and Hg in environmental samples and also to major and minor elements determination in various kinds of samples that cannot be destroyed or dissolved.
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