A neutron detector, based on scintillator and Cherenkov detector, was designed to monitor the D-T neutron generator in a PGNAA online measurement system in our previous study. In this paper, the foil activation method was used to study the intrinsic detection efficiency of the detector to the D-T neutron generator. The Fe foil with 99.99% purity was selected as the activation foil. The experiments and the GEANT4 simulations were carried out to study the intrinsic detection efficiency of the monitor. The results show that the intrinsic detection efficiency of the monitor is 20.42% ± 0.76%. Then, the calibrated detector and Fe foils were simultaneously used to measure the neutron flux of D-T neutron generator. The relative deviation between the results of the two methods is 5.64%.

在我们先前的研究中，设计了一种基于闪烁器和契伦科夫探测器的中子探测器，以监控PGNAA在线测量系统中的DT中子发生器。本文采用箔活化方法研究了探测器对DT中子发生器的固有探测效率。选择纯度为99.99％的铁箔作为活化箔。进行了实验和GEANT4仿真，以研究监视器的固有检测效率。结果表明，该监视器的固有检测效率为20.42％±0.76％。然后，将校准后的探测器和铁箔同时用于测量DT中子发生器的中子通量。两种方法的结果之间的相对偏差为5.64％。