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Recently, we are increasingly demanded for ^\u003c14\u003eC analysis of small-mass samples in these projects, and we have just started to establish a small-mass sample preparation system. In this first step, NIST Ox-II standard samples below 0.6 mgC, graphitized using our regular sample preparation protocol, were measured for ^\u003c14\u003eC. The small-mass samples produced low graphite yield and decreased ^\u003c12\u003eC^3+ beam currents. ^\u003c14\u003eC/^\u003c12\u003eC ratios were affected by the decrease in beam current intensity generated by samples \u003c0.3mgC. We investigated two different Fe/C ratios of ~2 and \u003e5 where amount of Fe catalyst is fixed to ~3mg in sample graphitization. Ion beam currents from targets produced with less catalyst were initially higher compared with those from targets with the usual amount of ~3mg Fe catalyst, but they did not last long and collapsed immediately as the sample was being sputtered by the Cs beam. 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  1. F300 宇宙地球環境研究所
  2. F300b 紀要
  3. 名古屋大学加速器質量分析計業績報告書
  4. 21

少量炭素試料のAMS^<14>C分析に向けて

https://doi.org/10.18999/sumrua.21.166
https://doi.org/10.18999/sumrua.21.166
654555f0-3a02-4397-bb18-90e54d7e2639
名前 / ファイル ライセンス アクション
21-25.pdf 21-25.pdf (2.1 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2011-05-11
タイトル
タイトル 少量炭素試料のAMS^<14>C分析に向けて
言語 ja
その他のタイトル
その他のタイトル A first step toward small-mass AMS radiocarbon analysis
言語 en
著者 南, 雅代

× 南, 雅代

WEKO 83140

ja 南, 雅代

Search repository
中村, 俊夫

× 中村, 俊夫

WEKO 83141

ja 中村, 俊夫

Search repository
Minami, Masayo

× Minami, Masayo

WEKO 83142

en Minami, Masayo

Search repository
Nakamura, Toshio

× Nakamura, Toshio

WEKO 83143

en Nakamura, Toshio

Search repository
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
キーワード
主題Scheme Other
主題 AMS
キーワード
主題Scheme Other
主題 Radiocarbon
キーワード
主題Scheme Other
主題 Graphitization
キーワード
主題Scheme Other
主題 加速器質量分析法
キーワード
主題Scheme Other
主題 放射性炭素
キーワード
主題Scheme Other
主題 グラファイト化
抄録
内容記述 The AMS facility at Center for Chronological Research, Nagoya University, is performing ^<14>C analysis of various organic samples for many research projects in archaeology, earth sciences, environmental studies and so on. Recently, we are increasingly demanded for ^<14>C analysis of small-mass samples in these projects, and we have just started to establish a small-mass sample preparation system. In this first step, NIST Ox-II standard samples below 0.6 mgC, graphitized using our regular sample preparation protocol, were measured for ^<14>C. The small-mass samples produced low graphite yield and decreased ^<12>C^3+ beam currents. ^<14>C/^<12>C ratios were affected by the decrease in beam current intensity generated by samples <0.3mgC. We investigated two different Fe/C ratios of ~2 and >5 where amount of Fe catalyst is fixed to ~3mg in sample graphitization. Ion beam currents from targets produced with less catalyst were initially higher compared with those from targets with the usual amount of ~3mg Fe catalyst, but they did not last long and collapsed immediately as the sample was being sputtered by the Cs beam. Therefore, the graphite reduced on ~ 3mg of Fe, regardless or sample size, could give better ^<14>C/^<12>C result. For samples with <0.3 mgC, isotopic fractionation between graphitization and/or measurement was observed. We should build a new reduction system suitable for small-mass samples.
言語 en
内容記述タイプ Abstract
抄録
内容記述 1-1.5mgCの試料を調製するために使用している当センターの通常のシステムを用いて、0.2-0.6mgCの微量のシュウ酸標準試料を調製した場合に、どの程度の^<14>C測定精度・確度が得られるかどうかの検討を行った。微量試料の場合、通常の試料量の場合に比べてグラファイト率が低下し、^<12>C^3+ビーム強度がかなり低い結果となった。特に0.3mgC以下の試料においては、ほとんどビーム強度が得られず、^<14>C/^<12>C比は明らかに低い値を示した。Fe/C比を2-3に調製したターゲットは、Fe/C比が5以上のターゲットより、はじめはイオンビームが高いが、測定過程で急激に減少し、結果的に確度も精度も悪い結果となった。これらのことから、今後、試料量にかかわらず、Fe量は3mgにし、穴径の小さいターゲットを使用する必要があると考えられる。さらに、グラファイト化の際に生成する水を効率的にトラップし、高グラファイト率な"微量飲料に特化したグラファイト化システム"を構築する必要がある。
言語 ja
内容記述タイプ Abstract
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
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.21.166
ID登録タイプ JaLC
書誌情報 ja : 名古屋大学加速器質量分析計業績報告書

巻 21, p. 166-169, 発行日 2010-03
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