@article{oai:nagoya.repo.nii.ac.jp:00011500,
 author = {中村, 俊夫 and Nakamura, Toshio and パルス, ルディ and Pals, Ludi},
 journal = {名古屋大学加速器質量分析計業績報告書},
 month = {Mar},
 note = {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 ^<14>C 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 ^<12>C-, ^<13>C- and ^<14>C- 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^<3+> 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 ^<13>C^<3+> ions stabilizes terminal voltage, which provides us highly stable isotope-ratio measurement. (4) a gas ionization detector measures E and E_<residual> of incoming ions, to separate ^<14>C^<3+> ions from various background ions. Provided that the background ions are rejected efficiently, ^<14>C 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 ^<14>C measurements with the new Tandetron is : (1) a measurement error of ^<14>C age can be as small as ±20 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., 第10回名古屋大学タンデトロン加速器質量分析計シンポジウム(平成9 (1997)年度)報告 ｢最新型タンデトロン加速器質量分析計(加速器年代測定システム)による高精度･高分解能14C年代測定の利用分野･方法の開拓(II)｣},
 pages = {27--45},
 title = {名古屋大学に設置されているGIC社およびHVEE社製の2台のタンデトロン加速器質量分析計の現状},
 volume = {9},
 year = {1998}
}