Differences in Calibration Factors of a Neutron Diode Dosimeter at Different Facilities

The calibration of neutron diodes as fast neutron dosimeters was undertaken at four different facilities. The results show significant variations in calibration factors, ranging from 1.4 to 14.7 mV/rad, across the four facilities. This is partially attributable to dose-rate dependency due to annealing of radiation induced defects. Further investigations on other potential reasons for the discrepancy is recommended, as well as call for additional international efforts in providing more standardized dosimetry services using accelerator-based high-energy neutron generators.