Radiation Sciences Graduate Program, McMaster University.
Department of Physics and Astronomy, McMaster University.
Health Phys. 2019 Sep;117(3):300-305. doi: 10.1097/HP.0000000000001111.
In a search to optimize neutron long counter design for overall efficiency and flat energy response, Monte Carlo simulations were carried out for a variety of detector design parameters using the Monte Carlo N-Particle Extended code. Based on the standard long counter design by McTaggart, moderator diameter, moderator back length, and longitudinal hole diameter were sequentially varied, and the sensitivity of each parameter to the long counter response was systematically analyzed. For each design, simulations were done in the neutron energy range of 1 keV to 10 MeV. From the simulation results, it turned out that out of the three moderator parameters, the moderator diameter is most sensitive for optimizing the long counter response. As the last design parameter, the effect of the central slow-neutron counter was investigated, which showed a significant difference in the response. The investigation of each design parameter gave clear insight on its effect on the long counter response and enabled one to determine the optimum condition.
为了优化中子长计数器的整体效率和平坦能量响应，使用蒙特卡罗 N 粒子扩展代码对各种探测器设计参数进行了蒙特卡罗模拟。基于 McTaggart 的标准长计数器设计，依次改变了慢化剂直径、慢化剂后端长度和纵向孔直径，并系统地分析了每个参数对长计数器响应的灵敏度。对于每种设计，在 1 keV 至 10 MeV 的中子能量范围内进行了模拟。从模拟结果来看，在三个慢化剂参数中，慢化剂直径对优化长计数器响应最敏感。作为最后一个设计参数，研究了中心慢中子计数器的效果，结果表明它对响应有显著影响。对每个设计参数的研究清楚地了解了它对长计数器响应的影响，并使人们能够确定最佳条件。
