^129 I 加速器质谱分析研究  

Accelerator mass spectrometry analysis of ^(129)I

作　　者：刘起[1,2,3] 周卫健[1,3,4] 侯小琳[1,3] 付云翀[1,3] 赵稳年[3,4] 卢雪峰[1,3] 陈宁[1,3] 张路远[1,3] 

机构地区：[1]中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安710075 [2]中国科学院大学,北京100049 [3]西安加速器质谱中心,陕西省加速器质谱技术及应用重点实验室,西安710061 [4]西安交通大学,西安710049

出　　处：《强激光与粒子束》2013年第8期2085-2090,共6页High Power Laser and Particle Beams

基　　金：科技部创新方法工作专项项目(2010IM031200);中国科学院重要方向性项目(KZCX2-YW-JS106,KZCX2-YW-BR-13,KZCX2-YW-147);黄土与第四纪地质国家重点实验室基金项目

摘　　要：通过对129I加速器质谱(AMS)分析中影响敏度和准确度各种参数的研究,如靶电极制备、压样、靶样中辅助介质(Matrix)的选择及使用比例等,优化了用于3 MV加速器质谱仪的SO-110型离子源的条件参数,确定129I-AMS测量的最佳靶电极材料为Cu,最佳的辅助介质为Nb粉末,Nb与AgI样品的最佳体积比为3∶1。在此条件下可以获得稳定且持续的I-束流进行测量129I/127I原子比值,实验测得西安加速器质谱仪的129I/127I本底值为1.52×10-14。Ion source is the key part of an Accelerator Mass Spectrometry （AMS） in view of analytical sensitivity, stability and accuracy. SO-110 Cs^＋ sputtering ion source developed by High Voltage Engineering Europe, is dedicated to AMS for both solid and gas target sources, which has been successfully applied to AMS instruments including one installed in Xi＇an AMS cen ter. By investigation of the effect of various parameters, such as the target preparation, holder characteristics, matrix selection and the ratio between AgI and matrix on AMS measurement of ^129I using SO-110 ion source, Cu is the suitable holder material, and Nb powder is the best matrix, and the optimal ratio of AgI ： Nb is 1 ： 3. A machine background of 1.52X10-14 for 129I/XZ7I was obtained using a NaI sample directly mixed with Nb powder and pressed in Cu target holder.

关 键 词：加速器质谱仪 SO-110离子源 129I 铯溅射 辅助介质 

分 类 号：TL817[核科学技术—核技术及应用]