{"_buckets": {"deposit": "eebea430-960b-48a1-a7c6-64f542b925e7"}, "_deposit": {"id": "11666", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "11666"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00011666"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Preliminary results of 2000-fourth international radiocarbon intercomparison : international blind test of \u003c14\u003e^C measurement"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2002-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "40", "bibliographicPageStart": "29", "bibliographicVolumeNumber": "13", "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": "A Tandetron accelerator mass spectrometer (Tandetron-I AMS system), an apparatus dedicated to high sensitivity radiocarbon (^\u003c14\u003eC) measurements, manufactured by General Ionex Corporation, USA, has been used since 1983 to measure the ^\u003c14\u003eC concentrations of environmental samples as well as ^\u003c14\u003eC dates of geological and archaeological materials, at the Center for Chronological Research (CCR), Nagoya University. In the meanwhile, a so-called second generation AMS ^\u003c14\u003eC apparatus (Tandetron-II AMS system) manufactured by High Voltage Engineering Europe, BV, the Netherlands has been installed successfully at CCR in 1997. Though we had experienced a lot of difficulties with the Tandetron-II just two years after its installation, we were able to start ^\u003c14\u003eC measurements with the machine in acceptable precision since the end of 1999. The ^\u003c14\u003eC measurement error (one sigma error)of the Tandetron-II is around \u00b120 - \u00b140 years, which is clearly smaller than that of the Tandetron-I (around \u00b150 - \u00b190 years). In addition, the reproducibility tests of ^\u003c14\u003eC measurements for the IAEA C1- C8 ^\u003c14\u003eC standards suggest that accuracy of ^\u003c14\u003eC measurement can be as good as around 0.5% We participated the Forth International Radiocarbon Intercomparison (FIRI) program started in 1999,after its set up at the time of the 15^\u003cth\u003e International Radiocarbon Conference at the University of Groningen, the Netherlands, in 1997. In the FIRI program, 10 samples of different materials were distributed to 92 ^\u003c14\u003eC laboratories of three different ^\u003c14\u003eC detection methods (25 AMS labs., 18 GPC labs. and 49 LSC labs.) from 37 different countries. Our AMS group of Nagoya University is one of the 25 AMS labs. The FIRI results have been reported preliminarily at the Edinburgh workshop on March 2001. We can also get the results by the web site of Radiocarbon (www. radiocarbon. org). 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