本工作计算了用于中子慢化实验装置的铁皮水箱和聚乙烯板的最佳安排问题。即计算出水箱或聚乙烯板的厚度为多少时,穿透水箱或聚乙烯板的中子能谱最理想(即热中子注量率比例最高)。实质是用Monte Carlo方法,从点源圆锥角抽样,计算出另一侧的点通量问题。 This work has calculated the optimal arrangement of metal tanks and polyethylene plates for neutron moderation experiments. To calculate the thickness of the water tank or polyethylene plate, the penetration of the water tank or polyethylene plate neutron spectrum is the best (ie, the highest proportion of thermal neutron fluence rate). The essence is to use the Monte Carlo method, sampling from the point source taper angle to calculate the other side of the point flux problem.