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采用实验测量和蒙特卡罗计算相结合的方法,较为系统地研究了在小空间、弱高能中子场等特定实验条件下的阈探测器测量技术。主要研究了γ射线自吸收、中子自屏蔽、阈探测器之间的扰动影响以及散射本底中子等因素。获得了自吸收、自屏蔽随活化箔厚度不同的变化规律。研究结果表明,选用合适厚度的活化片,可降低实验系统误差。用屏蔽法检验了散射本底中子影响,高阈能探测器本底中子的影响很小。
Using the combination of experimental measurement and Monte Carlo calculation, the threshold detector measurement techniques are systematically studied under the specific experimental conditions such as small space and weak high-energy neutron field. Mainly studied the γ-ray self-absorption, self-shielding neutron, the interference between the threshold detector and scattering background neutron and other factors. Obtained self-absorption, self-shielding with the activated foil thickness variation. The results show that the selection of the appropriate thickness of the activation sheet can reduce the experimental system error. The influence of scattering background neutrons was tested by the shielding method, and the effect of high threshold detectors on the background neutrons was very small.