~4He闪烁裂变中子探测器的中子灵敏度

Neutron sensitivity of helium scintillation fission neutron detector

对4 He闪烁裂变中子探测器的中子灵敏度进行了理论和实验研究。采用蒙特卡罗方法模拟了不同能量中子和不同厚度裂变靶产生的裂变碎片在4 He中的能量沉积,计算结果表明:中子在4 He气中的能量沉积曲线和裂变碎片的能量沉积曲线能够互补,从而使探测器对中子的能量响应变得更平坦;探测器的中子灵敏度为10-15 C.cm2量级。并对探测器的中子灵敏度进行了实验标定,实验结果与理论计算结果较为一致。

The neutron sensitivity of a helium scintillation fission neutron detector was investigated through theoretical and experimental methods.The energy deposition of neutrons with different energy and fragments of fission targets with different thickness in helium scintillator was calculated based on Monte Carlo method.The energy deposition curves of neutrons and fragments are complementary to each other,so the total energy deposition curve is relatively flatter.The neutron sensitivity was calculated to be 10-15 C·cm2 level.The neutron sensitivity was measured and the theoretical results of neutron sensitivity are consistent with experimental results.