The new AMS facility at Tianjin University-猫眼课题宝

天津大学新的 AMS 设施

DOI：

10.1007/s41605-018-0064-0

发表时间：

2018-06

期刊：

Radiation Detection Technology and Methods

影响因子：

0.6

通讯作者：

中科院分区：

文献类型：

作者：

Kejun Dong et al.

加速器质谱法（AMS）已被广泛应用于许多科学领域，是测定极低浓度长寿命核素的最佳方法之一。XCAMS系统是紧凑型加速器质谱仪的扩展，用于和。本文介绍了中国第一台XCAMS系统的基本情况和三种核素的初步性能，分别为、、和。实验步骤固体样品材料（石墨、、和）装入阴极支架进行AMS分析。带负电荷的离子（）被引出并加速到末端，分裂，一些轨道电子被剥离形成带正电荷的原子离子，并进一步加速。在加速后区域，磁性和静电装置分别作用于动量和能量分析。系统性能三种稀有同位素的测试标准分别从束流强度、测量精度和机器本底三个方面进行了设定。相应的材料和阴极保持器分别用于、和测试。根据验收测试结果，新的AMS系统已经分析了几批真实的样品。此外，几个二级标准进行了测量，以检查system.ConclusionThe新的XCAMS设备已安装成功，最新的性能也表明，机器是足够可靠的，在一般情况下。硬件组件和软件系统均处于良好状态，可在不久的将来进行准确和精确的数据分析。

IntroductionAccelerator mass spectrometry (AMS) has been used for the analysis of a lot nuclides in many scientific fields and is one of the most optimal methods to determine very low concentrations of long-lived nuclides. The XCAMS system is an extension of the CompactAccelerator Mass Spectrometer forand. A description of the first Chinese XCAMS system and initial performance of three nuclides of,, and, respectively, will be reported.Experimental proceduresSolid sample material (graphite,, and) is loaded into cathode holders for AMS analysis. The negatively charged ions () are extracted and accelerated to the terminal, broken-up, and some orbital electrons stripped off to form positively charged atomic ions, and accelerated further. In the post-acceleration region, the magnetic and electrostatic devices act on momentum and energy analysis, respectively. A multi-anode detector is used for the identification and detection of relevant isotopes and isobars.System performanceThe test criteria of three rare isotopes each were set for beam current intensity, measurement precision, and machine background. The corresponding material and cathode holder were, respectively, used for,, andtest. Several batches of real sample have already been analyzed by the new AMS system based on the acceptance test results. In addition, several secondary standards were measured to check the stability of the system.ConclusionThe new XCAMS facility has been installed successfully, and the latest performance also showed that the machine is reliable enough, in general. Both the hardware components and software system were in good condition for accurate and precise data analysis in the near future.