丁烷流气正比计数器
ATOMIC ENERGY SCIENCE AND TECHNOLOGY(2000)
Abstract
实验证明用丁烷作为流气式正比计数管的工作气体是可行的.与工作气体甲烷相比,工作电压偏高,坪曲线无明显差异.该计数器对14C β源有较好的响应.对自行研制的以丁烷作为工作气体、灵敏面积为50 cm2的KX-50型可携式α、β污染测量仪,用平板型239Pu α放射源测得坪曲线的坪长为600 V,坪斜每100 V为1.7 %,本底计数率0.02 s-1,对α粒子探测效率η2π(α)=53 %;用平板形90Sr-90Y β源测得的坪曲线坪长500 V,坪斜每100 V为1.8 %,本底计数率为3 s-1,探测效率η2π(β)=64 %.
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