SNC隕石Y000593の化学組成の特徴(II. 放射化学)

概要

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Three activation analysis methods, that is, prompt gamma ray analysis, instrumental neutron activation analysis and instrumental photon activation analysis, were applied to Antarctic nakhlite, Yamato-000593 together with Nakhla and other shergottites for the non-destructive determination of major and trace elemental contents. Powder samples representing six different portions within Y000593 were analyzed for discussing the chemical heterogeneity. As a result, major elements are homogeneously distributed within ±70%, and trace elements are homogeneously distributed within ±11% except for H, B, Cl, Br and rare earth elements. Based on similarity of chemical composition, crystallization age and cosmic-ray exposure age between Y000593 and Nakhla, these two meteorites were estimated to leave same meteoroid and to fall at separate point of the Earth.
東北大学の論文