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在线氚甄别测量中,甄别装置的甄别性能直接决定着测量数据的准确性和可靠性。本文基于Nafion膜进行了氚甄别测量的实验研究,分别在HTO、HT以及HTO+HT气氛下进行了实验,详细分析了气体瞬时流量、温度等条件对甄别性能的影响。结果表明,HTO在Nafion膜中的渗透率很容易达到90%以上,HT在Nafion膜中的渗透率小于0.19%。在适当的温湿度及气体流量条件下,一级Nafion干燥器在氚甄别测量中对HTO有99%以上的分离效果,HTO对HT的甄别比可达106以上。
In the online tritium screening measurement, the screening performance of the screening device directly determines the accuracy and reliability of the measurement data. In this paper, based on Nafion membrane tritium screening experimental study, respectively, in the HTO, HT and HTO + HT atmosphere experiments conducted a detailed analysis of gas instantaneous flow, temperature and other conditions on the screening performance. The results show that the permeability of HTO in Nafion membrane can easily reach over 90%, and the permeability of HT in Nafion membrane is less than 0.19%. Under proper conditions of temperature, humidity and gas flow, the first-stage Nafion dryer can separate more than 99% of the HTO in the tritium screening test, and the HTO to HT screening ratio can reach more than 106.