摘要
利用自行研制的FNQ-01型气体分凝器实验平台研究了不同条件组合对微量氙收集效率的影响,通过正交法设计优化了稀有气体氙分凝取样条件,选出最佳条件为原料气中氙的体积分数为1.046×10-3,冷凝温度-198℃,原料气进气流速0.3 L/min,分凝器收集压力55 kPa,蒸发温度-50℃。在此条件下,Xe的平均收集效率为73%。此外,还研究了不同进气方式对氙收集效率和分凝的影响。
Radionuclide verification is one of four international monitoring systems that were stipulated by the comprehensive nuclear test ban treaty. The radioactive noble gas xenon is a gaseous fission product of nuclear fuels. The radionuclides of Xe are characteristic nuclides of nuclear explosion. A nuclear event that violates the treaty may be found by monitoring the variation of radioxenon （mainly ^133Xe^m, ^133Xe, ^135Xe and ^131Xe^m） in global atmosphere through a global network of eighty stations of the international monitoring system （IMS）. Therefore, it is necessary to research the sampling technology for xenon isotopes. The possibilities for sampling technology （including condensation and concentration of xenon isotopes） is explored from pre-separating and pre-condensing microxenon sample with FNQ-01 gas condenser experimental platform. The collecting efficiencies of microxenon influenced by the different condensing conditions were studied on this experimental platform. The best con densing conditions optimized with the orthogonal design method are showed respectively as follows ; xenon concentration in sample 1. 046 × 10^-3, condensing temperature -- 198 ℃, gas flow rate 0.3 L/min, gas inlet pressure 55 kPa and evaporating temperature --50 ℃. The average collecting efficiency under these optimized conditions is 73%. Furthermore, the influences of different admitting methods to xenon collecting efficiency and condensation were discussed.
出处
《核化学与放射化学》
EI
CAS
CSCD
北大核心
2006年第2期99-104,共6页
Journal of Nuclear and Radiochemistry
关键词
低温
分凝
氙
正交设计
收集效率
low temperature
condense
xenon
orthogonal design
collecting efficiency
