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南極隕石の落下<14>^C年代測定の試み
https://doi.org/10.18999/sumrua.11.100
https://doi.org/10.18999/sumrua.11.100b81035b8-c2f2-4f11-962e-09332c52415e
名前 / ファイル | ライセンス | アクション |
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KJ00000187336.pdf (674.8 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2010-05-26 | |||||
タイトル | ||||||
タイトル | 南極隕石の落下<14>^C年代測定の試み | |||||
言語 | ja | |||||
その他のタイトル | ||||||
その他のタイトル | An attempt to measure carbon-14 terrestrial ages of Antarctic meteorites with a Tandetron AMS at Nagoya University | |||||
言語 | en | |||||
著者 |
南, 雅代
× 南, 雅代× Minami, Masayo× 中村, 俊夫× Nakamura, Toshio |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
権利 | ||||||
言語 | ja | |||||
権利情報 | 名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会 | |||||
権利 | ||||||
言語 | ja | |||||
権利情報 | 本文データは学協会の許諾に基づきCiNiiから複製したものである | |||||
抄録 | ||||||
内容記述 | Terrestrial age of meteorites gives us important information to estimate the terrestrial history of the meteorites. With the advent of AMS, the required sample mass of meteorite for measurement has been reduced as small as 0.1g. As a result, many more ^<14>C measurements have been performed intensively by the Toronto AMS group, Canada, the Arizona AMS group, USA, and so on. In Japan, AMS ^<14>C measurements of meteorites have been scarcely performed, to our regret. We are now at the early stage of the program for studying ^<14>C activities in meteorites, and constructing a system to extract ^<14>C from meteorites, in a similar method used by the Arizona group. A meteorite powder sample mixed with pure iron chips is combusted in a RF furnace (Leco HF-10) in the presence of purified carbon-free oxygen in a closed vacuum-tight glass line system. The sample gases evolved are passed through MnO_2 and Pt/CuO traps, and then the CO_2 is separated in a liq.N_2 trap, by pumping out oxygen completely. The amount of ^<14>CO_2 is determined by a pressure transducer in a certain volume and diluted with a known amount of ^<14>C^free CO_2. The total CO_2 is graphitized by reducing with hydrogen in a Fe-powder catalyst and the produced graphite is measured of its ^<14>C concentration with a Tandetron accelerator mass spectrometer at the Dating and Materials Research Center, Nagoya University. Extraction yields of CO_2 using the above method which employs RF melting of steel standards of known carbon content were about 90%. The new extraction procedure gave higher extraction yields and older ^<14>C ages than those using the old extraction method. Carbon yields of two Antarctic meteorites (Y-75102 and ALH-77294), however, were significantly low, and the carbon-14 terrestrial ages for the meteorites were different from the reported values. The results might be caused by imperfect combustions of the meteorites and high blanks from the crucible with iron chips alone. Further studies are needed to improve analytical techniques. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
内容記述 | ||||||
内容記述 | 第12回名古屋大学タンデトロン加速器質量分析計シンポジウム(平成11 (1999年度)報告 名古屋大学タンデトロン加速器質量分析計第1号機の研究実績と1号機,2号磯の利用計画 | |||||
言語 | ja | |||||
内容記述タイプ | Other | |||||
出版者 | ||||||
言語 | ja | |||||
出版者 | 名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会 | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
ID登録 | ||||||
ID登録 | 10.18999/sumrua.11.100 | |||||
ID登録タイプ | JaLC | |||||
関連情報 | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | URI | |||||
関連識別子 | http://ci.nii.ac.jp/naid/110000475630/ | |||||
書誌情報 |
ja : 名古屋大学加速器質量分析計業績報告書 巻 11, p. 100-112, 発行日 2000-03 |
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フォーマット | ||||||
application/pdf | ||||||
著者版フラグ | ||||||
値 | publisher |