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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14 Cβ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 5 0cm2 的KX 5 0型可携式α、β污染测量仪 ,用平板型2 3 9Puα放射源测得坪曲线的坪长为 6 0 0V ,坪斜每 10 0V为 1 7% ,本底计数率 0 0 2s-1,对α粒子探测效率 η2π(α) =5 3% ;用平板形90 Sr 90 Yβ源测得的坪曲线坪长 5 0 0V ,坪斜每 10 0V为 1 8% ,本底计数率为 3s-1,探测效率η2π(β) =6 4%
Experiments show that it is feasible to use butane as the working gas of the flow-gas proportional counter tube. Compared with the working gas methane, the working voltage is high, Ping curve no significant difference. This counter has a good response to the 14 Cβ source. For the KX50 Portable α, β Pollution Measuring Instrument developed by ourselves with butane as the working gas and a sensitive area of 50cm 2, the plate length of the flat curve measured by the flat type 2 3 9Puα radioactive source is 600V , The slope of every 10V is 17%, the background count rate is 0 0 2s-1, and the detection efficiency of α particle is η2π (α) = 53%. The plateau curve length measured by flat 90 Sr 90 Yβ source 5 0 0V, Ping oblique every 10 0V is 18%, the background count rate of 3s-1, detection efficiency η2π (β) = 64%