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利用蒙特卡罗程序MCNPX模拟计算了纯聚乙烯球和加入辅助材料的聚乙烯球对不同能量中子的响应函数曲线,使用计算出来的响应函数作为U-M-G软件解谱所需输入文件。研发了一套专门为此多球谱仪进行数据采集的放大甄别一体化电路,该电路可为SP9管提供900 V的工作高压,甄别阈设为0.5 V,总的放大倍数为200倍。使用研制的Bonner球谱仪对已知源强的Pu-Be中子源进行能谱测量,测量结果显示解出的能谱数据与实际Pu-Be源中子能谱较为符合,实验结果验证了该套多球谱仪可用于测量Pu-Be能区的中子谱。
The Monte Carlo program MCNPX was used to simulate the response curves of pure polyethylene spheres and polyethylene spheres with different materials to different energy neutrons. The calculated response function was used as the input file for the U-M-G software. Developed a set of specialized for this multi-spectrometer data acquisition amplification screening integrated circuit, the circuit can provide 900 V working voltage SP9 tube, the screening threshold is set to 0.5 V, the total magnification of 200 times. The developed Bonner spectrometer was used to measure the energy spectrum of Pu-Be neutron source with known source intensity. The measured results show that the solved energy spectrum data are in good agreement with the actual Pu-Be source neutron spectrum. The experimental results verify This multispectral spectrometer can be used to measure the neutron spectrum of the Pu-Be energy region.