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Cosmogenic K-40 in Antarctic Meteorites
https://nipr.repo.nii.ac.jp/records/1099
https://nipr.repo.nii.ac.jp/records/109975214fad-d9f9-4fe1-bb8e-9bfb066733b4
名前 / ファイル | ライセンス | アクション |
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KJ00000011625 (1.8 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1980-12-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Cosmogenic K-40 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) |
Nitoh, Osamu
× Nitoh, Osamu× Honda, Masatake× Imamura, Mineo |
|||||
著者所属(英) | ||||||
en | ||||||
Institute for Solid State Physics, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
Institute for Solid State Physics, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
Institute for Nuclear Study, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The present work extends the measurements of cosmogenic K-40 by mass spectrometry in the metal phase separated from chondrites and others, especially antarctic meteorites. Potassium-40 (t_<1/2> : 1.28×(10)^9y) is regarded as a stable nuclide rather than radioactive, in the time scale of cosmic ray exposure to chondrites. According to our current sampling, chemical and mass-spectro-metric techniques, starting from 10mg size metal samples and at a contamination level of lower than (10)^<-8>gK, we are able to measure the exposure ages as low as one million years. We determined the production rate of ^<40>K in Fe+Ni relative to the rates of ^<36>(Ar) and ^<36>(Cl), using samples separated from some mesosiderites and irons. Potassium-40 (irradiation) ages obtained in this work were compared with the ages based on the light rare gases contents. Both agreed with each other. Some samples are indicating their near-surface irradiation histories. In a few samples, Yamato-74116 and the Kirin chondrite, multi-stage irradiation histories were detected. | |||||
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 17, p. 189-201, 発行日 1980-12 |