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建立了移动式37Ar测量系统.采用1L的正比计数探测器和能谱分析方法对37Ar的测量进行了研究.分析了计数管的坪长、坪斜和本底等特点.结果表明,相比传统的计数方法,采用电子能谱法测量37Ar具有直观、坪长长、坪斜小等优点.相比传统的总计数方法,采用峰本底的方法可以将本底降低约一个量级,从而降低37Ar的探测下限.并研究了工作气体中不同甲烷含量对37Ar的测量能谱和计数管工作电压的影响,结果表明,加入10%的甲烷能够较好的改善37Ar的峰形,当甲烷含量大于10%时,峰形基本保持不变,而甲烷的含量较高时,达到坪区需要较高的工作电压.
A mobile 37Ar measurement system was established.The measurement of 37Ar was studied by 1L proportional counting detector and energy spectrum analysis.The characteristics of counting length, slope and background were analyzed.The results showed that compared with traditional , The measurement of 37Ar by electron spectroscopy has some merits such as intuition, flat length, small slope, etc. Compared with the traditional total counting method, using the background method can reduce the background by about one order of magnitude and thus reduce 37Ar, and the effect of different methane content in working gas on the measured energy spectrum of 37Ar and the working voltage of the counter tube was studied. The results show that the addition of 10% methane can better improve the peak shape of 37Ar. When the methane content is more than 10%, the peak shape remained unchanged, while the methane content is higher, to Ping area need higher operating voltage.