基于半经验法多球中子谱仪校准OA北大核心CSTPCD

A new method for calibrating Bonner Sphere Spectrometer by using semi-empirical method to deduct neutron scattering background was proposed.The detection efficiency of the He-3 proportional counters in each neutron sphere of Bonner Sphere Spectrometer was calibrated by using a thermal neutron reference radiation device.The reference 241 Am-Be neutron source was measured separately by each neutron sphere of the Bonner Sphere Spectrometer,and the fluence response of each neutron sphere was given by using the semi-empirical method to deduct the scattering.Combining the results of two experiments,the energy spectrum of 241 Am-Be neutron field was obtained and the fluence calibration factor of the spectrometer was given.The results also verify the ability of calibrated Bonner Sphere Spectrometer to measure fast neutron field.