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Even after corrections are made for undersaturation based on published values of rare gas ages, saturation specific activity of ^\u003c53\u003e(Mn) in these two meteorites is abnormally low compared with the average value of 470±100dpm/kg Fe in other antarctic meteorites. ^\u003c26\u003e(Al) (t_\u003c1/2\u003e=7.2×(10)^5y) and ^\u003c10\u003e(Be) (t_\u003c1/2\u003e=1.6×(10)^6y) were also measured in these two meteorites and in several others. These results as well as those of rare gas isotopes are discussed in terms of terrestrial ages of the meteorites, shielding effects in the parent bodies, undersaturation of the radioactivities and multi-stage irradiation histories. These two meteorites apparently experienced a two-stage exposure history with a long preirradiation (\u003e(10)^8y) under heavy shielding in a large body before the recent brief exposure (\u0026lsim;2×(10)^6y) in a much smaller body. 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Cosmic Ray Produced Radionuclides in Antarctic Meteorites
https://nipr.repo.nii.ac.jp/records/966
https://nipr.repo.nii.ac.jp/records/9661aa982ff-74b4-4105-842e-b7eccf88a059
名前 / ファイル | ライセンス | アクション |
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KJ00000011512 (2.6 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1979-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Cosmic Ray Produced Radionuclides in Antarctic Meteorites | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Nishizumi, Kunihiko
× Nishizumi, Kunihiko× Imamura, Mineo× Honda, Masatake |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Chemistry, College of Science, Rikkyo University | ||||||
著者所属(英) | ||||||
en | ||||||
Institute of Nuclear Study, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
The Institute for Solid State Physics, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Cosmic ray produced ^<53>(Mn) (t_<1/2>=3.7×(10)^6y) has been determined in seventeen antarctic meteorites, among which, two have extremely low contents of ^<53>(Mn) : 101±6dpm/kg Fe in Yamato-7301 and 22±3 in Allan Hills No. 8. Even after corrections are made for undersaturation based on published values of rare gas ages, saturation specific activity of ^<53>(Mn) in these two meteorites is abnormally low compared with the average value of 470±100dpm/kg Fe in other antarctic meteorites. ^<26>(Al) (t_<1/2>=7.2×(10)^5y) and ^<10>(Be) (t_<1/2>=1.6×(10)^6y) were also measured in these two meteorites and in several others. These results as well as those of rare gas isotopes are discussed in terms of terrestrial ages of the meteorites, shielding effects in the parent bodies, undersaturation of the radioactivities and multi-stage irradiation histories. These two meteorites apparently experienced a two-stage exposure history with a long preirradiation (>(10)^8y) under heavy shielding in a large body before the recent brief exposure (≲2×(10)^6y) in a much smaller body. These facts seem to illustrate the complex nature of the exposure histories of most meteorites. The consequence of these multi-stage exposures is also discussed. Terrestrial ages, estimated for a few antarctic meteorites from the ^<26>(Al)/^<53>(Mn) ratio, seem to be younger than 3×(10)^5 years. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 12, p. 161-177, 発行日 1979-03 |