用于放射性气体活度绝对测量的LND内充气正比计数管计量特性测试

摘要

Using the gas measuring device in National Institute of Metrology of China,the high voltage plateau characteristic curve for LND proportional counter tube was tested,and the experimental results were analysed,the operation conditions of the pneumatic proportional counter was discussed and it was taken as the basis of building gas activity absolute measuring device system.The experimental results show that the plateau area of proportional counter tube is 1 500 ～ 1 700 V,long for 200 V,flat slope about 10％/100 V,so that the performance had failed to meet requirements.It is necessary to design proportional counter independendy.%利用中国计量科学研究院电离辐射研究所初步设计的气体测量装置,测试LND正比计数管的高压坪特性,以及环境的本底干扰,并分析实验结果,计算能量响应效率,并讨论内充气正比计数管的工作条件,作为搭建气体活度绝对测量装置系统的基础.实验结果表明,LND内充气正比计数管工作高压坪曲线坪区为1500-1700 V,坪长为200 V,坪斜率约为10％/100 V,其计数结果受高压晃动与环境干扰明显.