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本文从β能谱分布函数出发,计算了在理想情况下,能量甄别型的β探测器(如有机闪烁探测器)对各种常用放射性核素(~(14)C、~(40)Sr、~(204)Tl……等)的效率—能量甄别曲线。所谓理想情况,就是以理想β谱入射,不考虑β粒子在探测器上的反散射和仪器的有限分辨率。此外,还讨论了β放射性核素的原子序数,β谱的最大能量、禁戒类型、入射粒子在探测器上的反散射和仪器的有限分辨率对效率—能量甄别曲线的影响,提出了确定甄别能量的方法,并与通常条件下的实验结果进行了比较。
In this paper, the energy dispersive β detector (such as organic scintillation detector) is used to calculate the emission spectra of various radionuclides (~ (14) C, ~ (40) Sr, ~ (204) Tl ...... Etc.) efficiency - energy screening curve. The so-called ideal case, is to enter the ideal β-spectrum, regardless of β-particle backscatter on the detector and the limited resolution of the instrument. In addition, the influence of the atomic number of β-radionuclides, the maximum energy of β-spectrum, the type of forbidden ring, the backscattering of incident particles on the detector and the limited resolution of the instrument on the efficiency-energy discriminant curve are also discussed. The method of screening energy is compared with the experimental results under normal conditions.