^(37)Ar测量系统的研制与能谱测量方法研究  

Development of a system of measuring ^(37)Ar by spectrum method

作　　者：向永春[1] 龚建[1] 李伟[1] 卞直上[1] 郝樊华[1] 王红侠[1] 王茜[1] 熊宗华[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《物理学报》2008年第2期784-789,共6页Acta Physica Sinica

摘　　要：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 portable system of measuring ^37Ar has been developed. Measurement of ^37Ar is realized by the proportional counter and spectrum analysis method. Plateau length, plateau slope and background have been analyzed. Compared with traditional counting method, the present method has the advantages of visibility, longer plateau length and smaller plateau slope, background is reduced by an order of magnitude which decreases the detection limit. Working gas of 10% methane improves the peak shape. Greater concentration of methane is not necessary because it does not make the peak shape better but needs higher working voltage.

关 键 词：气体正比计数管 ^37Ar 坪曲线 能谱法 

分 类 号：TL81[核科学技术—核技术及应用]