放射性核素核查氙归档样品HPGe γ谱仪测量源的制备  

Preparation of Measurement Sources of Archive Xenon Samples for HPGe γ Spectrometer in Radionuclide Verification

作　　者：陈占营[1] 常印忠[1] 王军[1] 李奇[1] 刘蜀疆[1] 

机构地区：[1]禁核试北京国家数据中心和放射性核素实验室,北京100085

出　　处：《核化学与放射化学》2010年第4期243-246,共4页Journal of Nuclear and Radiochemistry

摘　　要：惰性气体氙的监测是全面禁止核试验条约(CTBT)放射性核素核查的重要内容。为促进氙监测技术能力的提高,条约组织国际监测系统(IMS)司安装和认证组(ICG)2007年组织了惰性气体氙归档样品在台站和实验室间的传递实验。实验室在采用高纯锗伽玛(HPGeγ)谱法测量分析归档样品中放射性氙同位素活度时,需将样品气体中的氙高效定量转移至HPGeγ测量源盒中。以活性炭低温吸附、高温解吸结合隔膜泵转移的方法进行氙样品的转移,完成了2007年度4个CTBT氙归档样品HPGeγ测量源的制备。采用气相色谱法分析确定了每个样品氙的转移效率,氙的转移效率达约80%。The radionuclide network of the International Monitoring System（IMS） for verification of the comprehensive nuclear-test-ban treaty（CTBT） comprises of 80 particulate stations and 40 co-located noble gas stations,and 16radionuclide laboratories.The suspicious samples detected by the IMS radionuclide station will be further evaluated at the certified radionuclide laboratories. Therefore,it is expected that they could analyze the archive xenon samples by HPGe γ spectrometry or β-γ coincidence spectrometry.To improve the xenon monitoring ability,the Installation and Certification Group（ICG） of the IMS Division organized the LABS XENON EXERCISE in 2007. ICG distributed archive xenon samples from stations to participated laboratories during the exercise. In the process of detection of the xenon isotopes activity by HPGeγspectrometer,the xenon sample must be transferred from the archive bottle to a special measurement cell.Based on the principle that xenon was adsorbed by activated charcoal,then desorbed by heating and pumped by diaphragmatic pump,four CTBT archive xenon samples were transferred in 2007.The xenon transfer efficiencies were measured by gas chromatograph.The results show that the transfer efficiencies are all about 80%.

关 键 词：氙 CTBT 归档样品 HPGE Γ谱仪 转移效率 

分 类 号：TL751[核科学技术—辐射防护及环境保护]