中文摘要：

主要介绍了利用252Cf标准裂变中子能谱刻度快脉冲LS301型液闪中子探测器的探测效率的实验方法和结果,简要介绍了实验数据的处理过程,得到了阈值分别为0.5,0.7,1.0和1.6MeV,以及中子能量在10 MeV以下的探测器效率,并对测量结果进行了误差分析。同时为了检验实验结果的准确性,将实验结果与理论计算结果进行比较,两者在不确定度范围内符合得很好。

英文摘要：

Neutron detection efficiency of LS301 fast-neutron detector was calibrated by measuring the neutron energy spectrum of 252Cf source,which has a standard fission neutron spectrum.A low mass,fast ionization chamber is used as the fission fragments detector in the time-of-flight（TOF） spectrometer and afforded the start signal of neutron flight.The stop signal was offered by the anode of LS301.A measured TOF spectrum was turned to the neutron energy spectrum which will be compared with the standard one.Consequently,the fast-neutron detection efficiency of LS301 was obtained.Calibration procedures of experimental and data processing was given.Relative detection efficiencies were obtained separately for threshold settings of 0.5,0.7,1.0 and 1.6 MeV for neutron energies under 10 MeV.Experimental results accorded with theoretical efficiency curves which were calculated with the Monte Carlo code NEFF50.