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利用蒙特卡罗程序FLUKA模拟计算了聚乙烯慢化球和辅助材料慢化球对低能中子到高能中子的响应函数曲线。结果表明,对纯聚乙烯球来说,随着聚乙烯层厚度的增加,响应曲线峰逐步右移,峰值在高能区有所下降,对20 Me V以上的中子,无论纯聚乙烯球的尺寸有多大,其响应均下降到很低的程度;对辅助材料慢化球来说,中子能量小于1 Me V时,辅助材料慢化球与聚乙烯慢化球的响应曲线相似,但当中子能量大于20 Me V时,中子与辅助材料层发生(n,xn)反应,慢化球的响应呈显著上升趋势。分析计算结果,最终能够确定宽能谱多球中子谱仪的尺寸组合。
The Monte Carlo program FLUKA was used to simulate the response curves of polyethylene slow balls and auxiliary slow balls to low energy neutrons to high energy neutrons. The results show that for the pure polyethylene spheres, with the increase of the thickness of the polyethylene layer, the response curve gradually shifts to the right and the peak decreases in the high energy region. For neutrons above 20 MeV, The response is reduced to a very low level; for the auxiliary material slowing sphere, the response curve of the auxiliary material slowing sphere is similar to that of the slowing sphere of polyethylene when the neutron energy is less than 1 MeV, When the sub-energy is larger than 20 MeV, (n, xn) reaction takes place between the neutron and the auxiliary material layer, and the response of the slowing sphere shows a significant upward trend. Analysis and calculation results, and finally be able to determine the size of the combination of wide-spectrum multi-ball neutron spectrometer.