2024-03-28T16:54:53Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00011500
2023-11-17T02:55:27Z
879:1183:1184:1228
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
Present Status of the GIC-and HVEE-Tandetron AMS Systems of the DMRC, Nagoya University
中村, 俊夫
Nakamura, Toshio
パルス, ルディ
Pals, Ludi
open access
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
本文データは学協会の許諾に基づきCiNiiから複製したものである
加速器質量分析
タンデトロン
高輝度セシウムスパッタ負イオン源
同位体同時入射システム
リコンビネーター
ビームプロフィルモニタ
電離箱検出器
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)」
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
1998-03
jpn
departmental bulletin paper
VoR
https://doi.org/10.18999/10.19999/sumrua.9.27
http://hdl.handle.net/2237/13373
https://nagoya.repo.nii.ac.jp/records/11500
10.18999/10.19999/sumrua.9.27
http://ci.nii.ac.jp/naid/110001136041/
名古屋大学加速器質量分析計業績報告書
9
27
45
https://nagoya.repo.nii.ac.jp/record/11500/files/KJ00002410045.pdf
application/pdf
993.5 kB
2018-02-20