慢中子正比计数器探测效率研究

Study of Detection Efficiency of Slow Neutron Proportional Counter

推导出典型几何计数器中子探测效率及热能谱修正系数。~3He和BF_3计数器热中子探测效率实测值与理论预言值满意地符合。在E>0.1eV能区,仅考虑~3He(n,p)反应的理论值低于蒙特卡罗计算值[已计及(n,n)反应]和实验值,而实验数据与蒙特卡罗计算结果较好地符合。

The detection efficiencies of typical slow neutron proportional counters and the correction coefficients for Maxwell spectra are deduced. For 3He and EF3roportional counters, the measured detection efficiency of thermal neutron is consistent with the theoretic value satisfactoi'ily0 In the energy range above 0.1 eV, the theoretic values deduced from 3He (n, p) reaction are less than the Monte Carlo calculation when the (n, n) reaction has been taken into account and the experimental values.However, the experimental values are better consistent with the Monte Carlo calculation.