中子活化分析中煤样厚度及探测器位置的选择

摘要

利用 MCNP5程序包模拟14 MeV 脉冲中子照射一定厚度煤样，并通过时间控制获得非弹γ能谱和俘获γ能谱，再利用计数率的高低确定γ能谱的获取位置。结果表明：当煤样厚度为20 cm 时，非弹γ能谱的计数率达到饱和；当煤样厚度为35 cm 时，俘获γ能谱的计数率达到饱和。%Fourteen MeV pulsed neutron irradiated coal sample of certain thickness was simulated with the aid of MCNP5 package.Inelastic and captureγspectra were acquired by controlling the tally time. Collection location of γspectra is determined by count rates.Trends of inelastic and capture γspectra of coal samples with different thickness were observed.