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国防科技工业电离辐射一级计量站现有多球谱仪系统由一系列不同半径的聚乙烯球和位于球心的球形3He正比计数器(SP90)组成,聚乙烯球的半径分别为2.5、3、3.5、4、5、6、8、10和12inch,可测中子能量范围为热中子-20MeV。利用大型通用蒙特卡罗粒子输运程序MCNPX计算得到该套多球的探测响应曲线,如图1所示,可以看出该套多球对于1eV～100keV能区中子的
Defense Science and Technology Industrial Ionization Radiation Level I Metrology Station The existing multi-ball spectrometer system consists of a series of polyethylene balls with different radii and spherical 3He proportional counter (SP90) located in the center of the ball. The radius of the polyethylene ball is 2.5, 3, 3.5, 4, 5, 6, 8, 10, and 12 inch. The measured neutron energy range is from thermal neutron to 20 MeV. Using a large universal Monte Carlo particle transport program MCNPX calculation of the set of multi-ball detection response curve, shown in Figure 1, we can see that the set of multi-ball for the 1eV ~ 100keV energy neutrons