{"_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"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "A first step toward small-mass AMS radiocarbon analysis"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2010-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "169", "bibliographicPageStart": "166", "bibliographicVolumeNumber": "21", "bibliographic_titles": [{"bibliographic_title": "\u540d\u53e4\u5c4b\u5927\u5b66\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u696d\u7e3e\u5831\u544a\u66f8"}]}]}, "item_9_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "The AMS facility at Center for Chronological Research, Nagoya University, is performing ^\u003c14\u003eC analysis of various organic samples for many research projects in archaeology, earth sciences, environmental studies and so on. 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 \uff5e2 and \u003e5 where amount of Fe catalyst is fixed to \uff5e3mg 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 \uff5e3mg 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 \uff5e 3mg of Fe, regardless or sample size, could give better ^\u003c14\u003eC/^\u003c12\u003eC result. For samples with \u003c0.3 mgC, isotopic fractionation between graphitization and/or measurement was observed. We should build a new reduction system suitable for small-mass samples. 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