针对环境空气中气态氚浓度测量的难点,基于正比计数器原理,自行研制出了一套低本底气态氚测量仪.测氚仪中配有4根不同体积的正比计数器,将待测气体与工作气体充入已抽成真空的正比计数器中,采用能谱测量的方法对被测气体进行分析,氚的连续能量谱线与理论能谱相吻合,同时讨论了不同浓度的气态氚样的测量结果与样品含量的关系.研究结果表明,整套仪器稳定性良好,能实现对低浓度气态氚样的有效、直接测量.%Aimed at the difficulties of gaseous tritium concentration measurement in ambient air, based on the theory of proportional counter, made a self - developed gaseous tritium measuring instrument with low background. This set of instrument provided with four different volume proportional counters , filled the test gas and working gas with proportional counter , using the ray spectrometry method for analysis of the measured gas, and the continuous energy spectrum with the theoretical energy spectrum of tritium is consistent. Discussed different concentrations of gaseous tritium samples, the relationship between the measurements and the sample contents . The results show that the set of instrument have a good stability, it can achieve effectively and directly measure to low concentrations of gaseous tritium samples.
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