SNC隕石Y000593の化学組成の特徴(II. 放射化学)

• Main Authors: 白井 直樹, 大浦 泰嗣, 海老原 充
• Format: Report
• Language: Japanese
• Published: 東北大学理学部附属原子核理学研究施設 2003
• Subjects: Antarctic; Yamato; Antarc*
• Online Access: http://hdl.handle.net/10097/31036; https://tohoku.repo.nii.ac.jp/?action=repository_uri&item_id=12928; https://tohoku.repo.nii.ac.jp/?action=repository_action_common_download&item_id=12928&item_no=1&attribute_id=18&file_no=1

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.