基于SiC探测器的裂变靶探测系统中子灵敏度标定

Neutron Sensitivity Calibration of Fission Target Detection System Based on SiC Detector

在高压倍加器上,采用直流法和脉冲法分别标定了235 U和238 U靶构成的探测系统对14.9 MeV中子的灵敏度。对脉冲法的原理、方法及结果进行了介绍,并与直流法的测量结果进行了对比。结果表明:脉冲法和直流法的结果在不确定度范围内一致。脉冲法可在一次测量中直接扣除本底,而直流法的本底测量不准确,因此脉冲法是一种更准确的方法。本文方法可为脉冲中子源裂变探测器的相关研究提供参考。

The 14.9 MeV neutron sensitivity of the 235 U and 238 U detection system in Cockcroft-Walton accelerator was calibrated using current method and pulsed method,respectively.The principle,method and result of the pulsed method were introduced,and the result of pulsed method was compared with that of current method.The result shows that the two methods are consistent within the uncertainty.In principle,the pulsed method can deduct background by one measurement.Therefore,it is more accurate than current method.The method in this paper can provide a reference for study of the fission detector in the pulsed neutron experiment.