R＆D of a ^<129>I Direct Detection System with an Electrostatic Accelerator

静电加速器^<129>I直接检测系统的研发

• 批准号: 10555019
• 负责人: NAGASHIMA Yasuo
• 金额: $ 6.27万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555019/
• 关键词: AMS; Accelerator Mass Spectrometry; ^<129>I Element; Environment; Electrostatic Accelerator

An ultra high-sensitive accelerator mass spectrometry system, AMS, has been constructed successfully on a 12UD tandem electrostatic accelerator at the University of Tsukuba. A newly developed ^<97>MoO_2 molecular pilot beam method allowed us to realize the AMS system without any modifications in the 12UD accelerator. The AMS is tuned up to ^<129>I measurements. The performances for the ^<129>I AMS are listed up on the followings.1) Method ^<97>MoO_2 molecular pilot beam method2) Sample form AgI 3) Pilot material ^<97>MoO_34) Iodine ion current 〜10μA 5) ^<97>MoO_2 ion current 〜10nA6) Acceleration voltage 9.7MV 7)Pilot particle ^<97>Mo^<9+>8) Sensitivity 5×10^<-13> (^<129>I/^<127>I) 9)Accuracy 〜15%The improvement of the accuracy is strongly requested and it is under going. Though the performance of the system is not perfect now, the ^<129>I-AMS services are started for the users who want to measure the ^<129>I element.

超高灵敏度加速器质谱系统AMS已在筑波大学的12UD串联静电加速器上成功构建，新开发的^<97>MoO_2分子引导束方法使我们无需任何修改即可实现AMS系统。在 12UD 加速器中，AMS 已调至 ^<129>I 测量值。 ^<129>I AMS 的性能列在1) 方法 ^<97>MoO_2 分子引导束法 2) 样品形式 AgI 3) 引导材料 ^<97>MoO_34) 碘离子电流 〜10μA 5) ^<97>MoO_2 离子电流 〜10nA6) 加速电压 9.7MV 7 )先导粒子 ^<97>Mo^<9+>8) 灵敏度5×10^<-13> (^<129>I/^<127>I) 9) 精度~15% 虽然系统的性能并不完美，但精度的提高是强烈要求的，并且正在进行中。现在，为想要测量^<129>I元素的用户启动了^<129>I-AMS服务。

项目成果

Y.Nagashima et al: "Current status of 36Cl AMS program at the university of Tsukuba"Proc.of the International Workshop. on Frontiers in AMS. Vol.1. 123-128 (1999)

Y.Nagashima 等人：“筑波大学 36Cl AMS 项目的现状”国际研讨会论文集。

D.Arai, R.Seki, et al.: "^<36>Cl AMS measurement of JCO samples"Proceedings of the First Workshop on Environmental Radioactivity. 161-164 (2000)

D.Arai、R.Seki等人：“JCO样品的^ 36 Cl AMS测量”第一届环境放射性研讨会论文集。

Y.Nagashima et al.: "Status of the ^<36>Cl AMS system at the University of Tsukuba"Nuclear Instruments and Methods B. B127. 129-133 (2000)

Y.Nagashima等人：“筑波大学的^ 36 Cl AMS系统的状态”核仪器和方法B.B127。

R.Seki et al.: "The JCO criticality accident at Tokai-mura, Japan : an overview of the sampling campaign and preliminary results"JOURNAL OF ENVIRONMENTAL RADIOACTIVITY. Vol.50. 3-14 (2000)

R.Seki 等人：“日本东海村的 JCO 临界事故：采样活动概述和初步结果”环境放射性杂志。

Y.Nagashima: "Status of 36C and 129I AMS at the University of Tsukuba"Proc.of8^<th> International Conference on Acc.Mass Spec.. (In Press). (2000)

Y.Nagashima：“筑波大学 36C 和 129I AMS 的状态”Proc.of8^<th> 国际 Acc.Mass Spec 会议（正在出版）。