{"_buckets": {"deposit": "17dae840-53a2-4367-97ed-89a6d1039298"}, "_deposit": {"id": "11500", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "11500"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00011500"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Present Status of the GIC-and HVEE-Tandetron AMS Systems of the DMRC, Nagoya University"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1998-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "45", "bibliographicPageStart": "27", "bibliographicVolumeNumber": "9", "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": "In the financial years of 1995-1996,we introduced a second-generation Tandetron (a carbon dating system, Model 4130-AMS) which was manufactured by High Voltage Engineering Europe (HVEE) BV, the Netherlands. Main improvements of the 2nd-generation Tandetron compared with the old GIC(General Ionex Corporation)-Tandetron are : (1) a high intensity cesium sputter ion source is equipped with the new system, so that the ^\u003c14\u003eC counting rate is almost one order higher than that for the old system. In addition, since up to 59 targets can be loaded at a time, measurements can be conducted more efficiently. (2) carbon isotopes ^\u003c12\u003eC-, ^\u003c13\u003eC- and ^\u003c14\u003eC- are injected into a tandem accelerator simultaneously, by using a recombinator system, which will archive high accuracy measurements of the carbon isotope ratio. (3) the terminal voltage of the accelerator is 2.5MV, which gives the maximum yield in producing C^\u003c3+\u003e from C- in the charge exchange process of the tandem accelerator. In addition, a slit feedback system with a position sensitive Faraday cup to monitor the energy of accelerated ^\u003c13\u003eC^\u003c3+\u003e ions stabilizes terminal voltage, which provides us highly stable isotope-ratio measurement. (4) a gas ionization detector measures E and E_\u003cresidual\u003e of incoming ions, to separate ^\u003c14\u003eC^\u003c3+\u003e ions from various background ions. Provided that the background ions are rejected efficiently, ^\u003c14\u003eC ages older than 60,000 will be measurable with this system. (5) A computer program is equipped with the system which controls the carbon-isotope-ratio measurement for multi-samples automatically. This provides us a high-efficient measurement without any hard works of operation staff. These improvements are discussed here in detail. As the results of those improvements stated above, the highest performances in the ^\u003c14\u003eC measurements with the new Tandetron is : (1) a measurement error of ^\u003c14\u003eC age can be as small as \u00b120 years with a measurement time of a few tens of minutes for a carbon sample of less than 1 mg ; (2) a full automatic measurement can be routinely performed ; (3) more than 3,000 samples can be measured annually.", "subitem_description_type": "Abstract"}]}, "item_9_description_5": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "\u7b2c10\u56de\u540d\u53e4\u5c4b\u5927\u5b66\u30bf\u30f3\u30c7\u30c8\u30ed\u30f3\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u30b7\u30f3\u30dd\u30b8\u30a6\u30e0(\u5e73\u62109 (1997)\u5e74\u5ea6)\u5831\u544a 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