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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. 19

石英中のC-14の抽出法の検討(第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告)

https://doi.org/10.18999/sumrua.19.154
https://doi.org/10.18999/sumrua.19.154
9f895f41-0120-4d2a-b2a3-9b04e5521e9e
名前 / ファイル ライセンス アクション
KJ00005462220.pdf KJ00005462220.pdf (362.3 kB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2010-06-14
タイトル
タイトル 石英中のC-14の抽出法の検討(第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告)
言語 ja
その他のタイトル
その他のタイトル The extraction of carbon-14 from quartz samples(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)
言語 en
著者 窪田, 卓見

× 窪田, 卓見

WEKO 84830

ja 窪田, 卓見

Search repository
KUBOTA, Takumi

× KUBOTA, Takumi

WEKO 84831

en KUBOTA, Takumi

Search repository
馬原, 保典

× 馬原, 保典

WEKO 84832

ja 馬原, 保典

Search repository
MAHARA, Yasunori

× MAHARA, Yasunori

WEKO 84833

en MAHARA, Yasunori

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中野(太田), 朋子

× 中野(太田), 朋子

WEKO 84834

ja 中野(太田), 朋子

Search repository
NAKANO-OHTA, Tomoko

× NAKANO-OHTA, Tomoko

WEKO 84835

en NAKANO-OHTA, Tomoko

Search repository
中村, 俊夫

× 中村, 俊夫

WEKO 84836

ja 中村, 俊夫

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NAKAMURA, Toshio

× NAKAMURA, Toshio

WEKO 84837

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
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
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 Cosmogenic radionuclides are produced in rocks depending on the thick of surface ground covering them, which derives that erosion rate can be evaluated from the relation of accumulation and half life of cosmogenic radionuclide. Among rocks, quartz is chemically stable and abundant in the environment and hence it is useful material for evaluation of erosion rate and dating. The analysis of Al-26, Be-10 and C-14 in quartz yields the erosion rate from 5×10^<-6> to 0.1 cm/y. Unlike to beryllium and aluminum, extraction of carbon is required to treat gaseous species. In this paper we show the recovery of carbon from quartz and graphite mixture. Because the amount of carbon in quartz is far from enough to make AMS target pieces, we have added some graphite as carbon carrier to quartz samples. Among simple and stable carbon compounds (materials), natural graphite is quite low C-14 content and hard to be contaminated from atmospheric C-14. All samples were preheated at 450℃ for 12 h and then volatile contamination on sample surface was decreased. CO gas generated from quartz melting reaction with graphite was oxidized to CO_2 through heated Pt and CuO mixture, after which CO_2 gas was purified by a liquid nitrogen/ethanol trap. A small aliquot of CO_2 was used to measured stable isotope ratio and the remains were reduced in hydrogen atmosphere to graphite on iron powder which was subject to AMS analysis. The result that the carbon recovery ratio was less than 3% and was decreased with additive carbon amount suggests that some reagent, such as platinum and iron, is required to enhance the melting reaction. Because the carbon recovery ratio was evaluated here on the basis of additive carbon amount, it is unknown that the exact amount of C-14 from inside quartz crystal. The problem would be clarified by using quartz samples doped with C-14 produced through low-flux neutron or photon irradiation to them. All samples indicated that the value of δC-13 in about 5 permil. The background C-14 was evaluated to at most 2.8×10^<-6> atoms. In order to evaluate erosion rates, sources of contamination will be investigated to decrease background in carbon extraction system.
言語 en
内容記述タイプ Abstract
内容記述
内容記述 第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告<第2部> Proceedings of the 20th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research in 2007 日時:平成20 (2008)年1月10日(木)~11日(金) 会場:名古屋大学野依記念学術交流館 Date:January10th-11th, 2008 Venue:Nagoya Uhiversity Noyori Conference Hall
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
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.19.154
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/110007151033/
書誌情報 ja : 名古屋大学加速器質量分析計業績報告書

巻 19, p. 154-159, 発行日 2008-03
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