中文摘要：

西安加速器质谱仪（Xi’an-AMS）于2006年8月正式投入运行。在近两年的分析测试中,仪器运行正常,成功测试了14C1、0Be2、6Al和129I等共2 741个待测样品,对外测试服务占总测样品数比例达50%。为进一步优化仪器的测试性能,提高测样效率,西安加速器质谱中心与荷兰高压静电公司（HVEE）合作,对原有离子源部分进行升级改造,并对计算机控制部分做了优化。改造后的离子源头可以长时间稳定运行,且在14C测量中未发现记忆效应。

英文摘要：

Xi＇an Accelerator Mass Spectrometry （Xi＇an-AMS） has been put into routine operation since August, 2006. The main instrument--3 MV accelerator mass spectrometer, has performed steadily and reliably. More than 2 741 samples were analyzed, which included 14C, ^10Be, ^26Al and ^129I. About 50% of the samples were submitted by the outside users. In addition, to further improve the performance and efficiency of the system, an insertable head of the ion source was redesigned and the control system was upgraded considerably, based on collaboration with High Voltage Engineer of Europe （HVEE）. The measurement results show that the new source head runs more steadily and there is little memory effect on 14C measurement.