{"created":"2021-03-01T06:19:51.487831+00:00","id":12869,"links":{},"metadata":{"_buckets":{"deposit":"60e8cb69-f714-40c0-a86a-f46b1525429c"},"_deposit":{"id":"12869","owners":[],"pid":{"revision_id":0,"type":"depid","value":"12869"},"status":"published"},"_oai":{"id":"oai:nagoya.repo.nii.ac.jp:00012869","sets":["879:1183:1184:1318"]},"author_link":["83140","83141","83142","83143"],"item_1615768549627":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_9_alternative_title_19":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"A first step toward small-mass AMS radiocarbon analysis","subitem_alternative_title_language":"en"}]},"item_9_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2010-03","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"169","bibliographicPageStart":"166","bibliographicVolumeNumber":"21","bibliographic_titles":[{"bibliographic_title":"名古屋大学加速器質量分析計業績報告書","bibliographic_titleLang":"ja"}]}]},"item_9_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"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.","subitem_description_language":"en","subitem_description_type":"Abstract"},{"subitem_description":"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。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.18999/sumrua.21.166","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_32":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"名古屋大学年代測定資料研究センター","subitem_publisher_language":"ja"}]},"item_9_select_15":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"publisher"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"南, 雅代","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"83140","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"中村, 俊夫","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"83141","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Minami, Masayo","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"83142","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nakamura, Toshio","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"83143","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-02-20"}],"displaytype":"detail","filename":"21-25.pdf","filesize":[{"value":"2.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"21-25.pdf","objectType":"fulltext","url":"https://nagoya.repo.nii.ac.jp/record/12869/files/21-25.pdf"},"version_id":"d5d1ab8f-715d-461b-b365-134bef76eccc"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"AMS","subitem_subject_scheme":"Other"},{"subitem_subject":"Radiocarbon","subitem_subject_scheme":"Other"},{"subitem_subject":"Graphitization","subitem_subject_scheme":"Other"},{"subitem_subject":"加速器質量分析法","subitem_subject_scheme":"Other"},{"subitem_subject":"放射性炭素","subitem_subject_scheme":"Other"},{"subitem_subject":"グラファイト化","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"少量炭素試料のAMS^<14>C分析に向けて","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"少量炭素試料のAMS^<14>C分析に向けて","subitem_title_language":"ja"}]},"item_type_id":"9","owner":"1","path":["1318"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2011-05-11"},"publish_date":"2011-05-11","publish_status":"0","recid":"12869","relation_version_is_last":true,"title":["少量炭素試料のAMS^<14>C分析に向けて"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-01-16T04:58:46.967388+00:00"}