Study of Accelerator Mass Spectrometry with a Large Tandem Accelerator

从1992年开始，在大型12UD串列静态加速器的基础上，研制了一套加速器质谱仪(AMS)系统。在不对现有串列系统进行任何改动的情况下，成功地测试了一种“双分子先导束法”，并将其用于AMS测量。这两个专门用于AMS研究的系统都连接到TANDEM系统，作为AMS系统的重要组成部分工作得很好。到目前为止，已经开始检测^&lt；14&gt；C，^&lt；26&gt；Al，^&lt；32&gt；Si，^&lt；36&gt；Cl元素。经确认，测量误差在2%以内，灵敏度为3*10；-15。这种性能对于许多使用^&lt；14&gt；C测量的研究来说已经足够好了。另一方面，现在对另一种元素的测量精度不高，因此，为了提高较重元素的检测精度，我们计划用双分子导束方法测量129I，作为一个非常重要的元素，特别是在我们的大型串列加速器上。

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.