新型氚蒸馏装置的研制及性能验证

为提高硅胶吸附法监测环境空气中氚的样品前处理效率,采用铸铝加热方式结合温度自动控制技术,研制了一种用于环境硅胶样品自动化氚水蒸馏的装置。经实验验证,该装置选择250℃的加热温度,15 min的蒸馏冷凝收集时间为硅胶吸附氚化水的最佳解析条件,此时对硅胶中氚化水的平均回收率大于99%,氚记忆效应小于0.2‰,100 g饱和硅胶样品能解析水7～10 ml,满足液闪测量要求,研制的氚水蒸馏装置较以往装置蒸馏效率提高了近3倍,能耗减少约77%。

Performance Test on a New Tritium Distillation-collect System

A tritium distillation-collect system for air sample from environment is constructed for silica gel adsorbing-tritiated water sample with a novel structure,auto-controled temperature technique and alu minum founding materials.The whole performance was confirmed,and silica gel adsorbing-tritiated water sample from environmental air was operated in the system.a series of experiments were completed which showed the best sample treatment time was 15 min,allowing a desorption water quantity of 7~10 ml from 100 g silica gel liquid scintillation analysis sample and the average recycle efficiency could reach 99% when the heating temperature was 250℃.The experiment proves the memory effect of tritium was under 0.2‰,and the distillation efficiency of this new system raised more than 3 times,saving 77% eletricity expend incidentally.