Study of Accelerator Mass Spectrometry with a Large Tandem Accelerator

从1992年开始，我们用12 UD串列静电加速器研制了加速器质谱（AMS）系统，并成功地试验了双分子引导束方法，在不改变现有串列加速器系统的情况下，用于AMS测量。我们还建造了负离子源系统和粒子探测系统。这两个系统作为AMS系统的重要组成部分，都与AMS的串联系统相连接，运行良好，目前已开始对~（13）<14>C、~（13）<26>Al、~（13）<32>Si、~<36>（13）Cl等元素进行检测。实验结果表明，<14>该方法可实现2%误差范围内的~（10）C测量，灵敏度为3 × 10 ~（10<-15>）。这种性能对于许多使用^ C测量的研究来说足够好<14>。另一方面，目前对另一种元素的测量精度还不高，为了提高对重元素的探测精度，我们计划在我们的大型串列加速器上用双分子引导束方法测量129 I这一重要元素。

An accelerator mass spectrometry (AMS) system has been developed with a large 12UD tandem static accelerator as a three year project starting from 1992.A 'di-molecular pilot beam method' has been tested successfully and is used for AMS measurements without any modification to the existing tandem system.Both a negative ion source system and a particle detection system have been constructed. Both system dedicated on the AMS study are connected to the tandem system and are working very well as a essential parts of the AMS system.Up to now, the detection of ^<14>C,^<26>Al, ^<32>Si, ^<36>Cl elements have been commenced. It is confirmed that ^<14>C measurement can be performed within 2% error and with 3*10^<-15> sensitivity. This performance is good enough for many studies using ^<14>C measurement. On the other hand, the precision of the measurement of another element is not highly now.Hereafter, Adding to an improvement on detection accuracy of the heavier element, we are planning to measure 129I with di-molecular pilot beam method as a very important elements especially on our large tandem accelerator.