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在強放射性样品的測量中,要求探测器具有較短的死时間、較长的寿命和較好的稳定性。闪爍計数器則能較好地满足这些要求。哈萊(J.H.Harley)等又以減薄閃爍体和提高甄別电压(同时也就降低了效率)的方法在很大程度上降低了計数器的本底。我們应用类似的原理制作了一个探測效率尚高(对Co~(60)的β粒子的探测效率約为40%、本底不太高(无屏蔽时为30計数/分)、死时間約为5微秒、可供強放射性样品(2×10~4-1×10~5計数/分)测量用的β塑料閃爍計数器。
In the measurement of strong radioactive samples, the detector is required to have a shorter dead time, longer life expectancy and better stability. Scintillation counter is better able to meet these requirements. J.H.Harley et al. Again, the method of thinning the scintillator and increasing the discrimination voltage (and at the same time reducing the efficiency) greatly reduced the counter’s background. We used a similar principle to produce a high detection efficiency (about 40% detection efficiency for beta particles of Co ~ (60)), not too high background (30 counts / min for unshielded), dead time For 5 microseconds, a beta plastic scintillation counter is available for the measurement of strong radioactive samples (2x10-4-1x10-5 counts / minute).