工艺尾气氚测量装置的研制

Development of a measuring device for tritium in process

通过选择装置材料、优化结构及参数,设计制作了有效体积为11.0 m L的测氚电离室,用于工艺尾气中氚含量的测量。用质谱法标定绘制了工作曲线,工作曲线线性范围为0.013 4%~0.168%(体积)。测试表明:装置泄漏率为5.5×10^(-7)Pa·m^3/s,密封性良好;本底电流为2.98×10-^(14)A;装置探测下限值为1.35×10^(-4)%(体积);变异系数≤1.50%;仪器响应时间≤10 s,响应速度快,测量周期短,满足工艺样品的检测需求。

Measuring device for tritium in process exhaust using ionization chamber（effective volume 11. 0 m L）was developed after material selection,structure design and parameter optimization. The calibration curve was plotted with a good linearity in the range of 0. 013 4% —0. 168%（v）. The results showed that the detection lower limit of the device was 1. 35 × 10^（-4）%（v）; the coefficient of variation was no more than 1. 50%; and the response time was less than 10 s. The process measurement requirements were fairly met.