基于常温吸附的放射性氙样品高效纯化制备技术研究

大气放射性氙是全面禁止核试验条约重要的监测目标，为提高氙样品的探测灵敏度，在进行放射性活度测量前，需将样品纯化、除氡并转移至测量容器。本文针对氙样品高效纯化制备过程中的关键技术，研究了氙在三级吸附柱上的吸附脱附行为，并考察了氙样品量及色谱参数对氙色谱峰宽的影响，确定了纯化制备流程参数。利用氙样品对纯化制备流程进行测试，氙的回收率大于90%，氡去污因子大于10⁴，实现了放射性氙样品的高效纯化制备。

Study on Efficient Purification and Preparation of Radioxenon Sample by Adsorption at Normal Temperature

Radioxenon isotopes in atmosphere are the important monitoring component of Comprehensive Nuclear-Test-Ban Treaty. In order to improve the radioactive detection sensitivity of xenon samples, it is necessary to purify the sample, remove radon and transfer it to container before measurement. The key technologies in process of efficient purification and preparation of xenon samples were researched. The adsorption and desorption behaviors of xenon on three stage adsorption columns were studied. The effects of xenon sample volume and chromatographic parameters on the peak width were investigated, and the purification and preparation process parameters were determined. The recovery of pure xenon for purification and preparation process is more than 90% by tested with xenon samples, and the radon decontaminate coefficient is more than 10⁴. The efficient purification and preparation of radioxenon samples is realized.