离线产氚实验中氚在线监测系统的研制

在增殖剂离线产氚实验中，如何准确实时测量回路中氚浓度和形态（HTO/HT）对于掌握产氚增殖剂氚释放行为，改进增殖剂的产氚性能非常重要。针对离线产氚回路中载气流量小、回路中气体量小以及载气为Ar等特点，基于流气式电离室原理研制了一套数字化氚浓度在线测量系统。该系统中电离室灵敏体积为50 mL，数字化仪表可自控获取、处理及显示回路中的氚浓度。测试结果表明，在Ar气氛下，在35 V左右，电离室即进入饱和区；该系统探测下限可达3.7×10 7 Bq/m 3，能满足离线产氚实验中氚在线监测的要求。

Development of Online Measurement System of Tritium in Out-of-pile Tritium Release Experiment

It is very important to accurately measure tritium concentration and morphology for mastering tritium release behavior of tritium production breeder and improving the performance of tritium production breeder in out-of-pile tritium release experiment. According to the characteristics of small flow of carrier gas, small quantity of gas and argon as carrier gas, based on the ionization chamber, the digital online tritium measurement system was developed. The sensitive volume of ionization chamber is 50 mL, the digital instrument can automatically obtain the tritium concentration, at the same time, process and display it. The results show that the saturated zone of ionization chamber is about 35 V in argon, and the detection limit is 3.7×10 7 Bq/m 3, which is satisfactory for online tritium measurement in out-of-pile tritium release experiment.