The status of the AMS system at MALT in its 20th year
The status of the AMS system at MALT in its 20th year
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DOI：
10.1016/j.nimb.2015.05.032
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发表时间：
2015-10-15
影响因子：
1.3
通讯作者：
Tokuyama, Hironori
中科院分区：
文献类型：
--
作者：
Matsuzaki, Hiroyuki;Nakano, Chuichiro;Tokuyama, Hironori
MALT（Micro Analysis Laboratory，Tandem accelerator，The University of Tokyo）是一种使用Pelletron（TM）5 UD串列加速器产生的离子束的“高灵敏度和精确的元素和同位素微量分析系统”。目前，多核素AMS（Be-10，C-14，Al-26，Cl-36，I-129）系统已投入使用，并在精度和灵敏度方面表现出良好的性能，该加速器还可用于PIXE，NRA，ERDA/RBS测量。自20年前MALT启动以来，加速器的总运行时间已超过95，000小时。福岛第一核电站（FDNPP）事故发生后，许多与I-129相关的项目已经进行。从I-129到事故现场I-131分布的回顾性重建是居民剂量评价的重要任务之一。事故中产生的I-129也可作为环境中一般碘动力学的示踪剂。作为与核活动有关的环境评估的新工具，包括过去大气层核弹试验的全球沉降物、乏燃料后处理厂的影响以及切尔诺贝利和FDNPP等核事故，目前正在开发U-236-AMS系统。(C)2015 Elsevier B. V.版权所有。
MALT (Micro Analysis Laboratory, Tandem accelerator, The University of Tokyo) was designed for a 'highly sensitive and precise elemental and isotopic microanalysis system' using an ion-beam generated by a Pelletron (TM) 5UD tandem accelerator. Currently, a multi-nuclide AMS (Be-10, C-14, Al-26, Cl-36, I-129) system is available and shows good performance in both precision and sensitivity, and the accelerator serves for PIXE, NRA, ERDA/RBS measurements as well. The total operation time of the accelerator has been over 95,000 hours since the start of MALT, 20 years ago.After the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, many projects related to I-129 have been conducted. The retrospective reconstruction of the I-131 distribution at the accident from I-129 is one of the most important missions for dose evaluation of the residents. The accident-derived I-129 is also quite useful as a tracer for the general iodine dynamics in the environment.As a new tool for environmental assessment related to nuclear activity, including the global fallout from past atmospheric nuclear bomb testing, effects from the spent fuel reprocessing plant, and nuclear accidents such as Chernobyl and FDNPP, a U-236-AMS system is now under development. (C) 2015 Elsevier B.V. All rights reserved.