结构设计和磁场对狭缝式脉冲裂变中子探测器的n/γ分辨能力的影响

Influence of Configuration Designs and Magnetic Field on n-γ Discrimination for a Slot-Calibrated PIN Fission Chamber

采用MCNP程序计算了狭缝式裂变中子探测器的结构设计和磁场对n/γ分辨能力的影响。根据探测系统对2 MeV中子的灵敏度,得到了系统的n/γ分辨参数。结果表明,未添加磁场偏转系统时,能够获得的n/γ分辨大于5,满足设计要求。添加磁场偏转系统后,n/γ分辨能力至少提高两个量级。

The influence of configuration designs and magnetic field on n/γ discrimination for the slot-calibrated PIN fission chamber detector system was calculated by using MCNP code. Based on the 2 MeV neutron sensitivities, the n/γ discriminations of the system were obtained. The results indicate that the design of the system can meet the needs of practical measurements with n/γ discrimination greater than 5 without a magnetic field. And with a magnetic field, the n/γdiscrimination can be increased more than 100 times.