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采用流气式正比计数管进行环境样品总α及总β放射性含量测定时,为在较长的计数时间内稳定地测量,要求所用计数气体有足够长的坪区、较小的坪斜、本底计数率低和能量响应好。纯甲烷是一种比较理想的计数气体,但其易爆性限制了它的使用范围。也可采用P-10气(氩-甲烷混合气)来代替,但它的坪区短、坪斜大和本底计数率高,使测量的效果不够理想,而且价格较贵。 文献[1]报道了采用液化石油气作为自猝灭流光计数管的计数气体。由于它的自猝灭效
When using flow proportional proportional counter to measure the total α and total β radioactive content of environmental samples, it is required to measure the gas stably for a long counting time. Low counting rate and good energy response. Pure methane is an ideal counting gas, but its explosive limits its use. P-10 gas (argon-methane mixed gas) may also be used instead, but its plateau area, flatness and background count rate are high, making the measurement less than ideal and expensive. Reference [1] reported the use of liquefied petroleum gas as a self-quenching flow counting light counting gas. Due to its self-quenching effect