Efficiency calibration technology of ¹³³Xe gas by efficiency transfer code of ¹³³Ba disk source for HPGe detector

An efficiency transfer code based on disk source is established to calibrate efficiency of ¹³³Xe gas sample. ¹³³Ba disk sources were used to simulate the detection efficiency of ¹³³Xe cylindrical volume source. Relationships were established based on peak efficiency ratio between ¹³⁷Cs and ¹³³Ba. Cascade summing effects in close geometry gamma-ray spectrum of ¹³³Ba was solved based on the ratios calculated by LabSOCS simulation and the experiment data of long and short distances. Finally, the efficiency transfer code is used to calibrate ¹³³Xe gas sample's efficiency. The detection efficiencies using the efficiency transfer code are consistent with the results of disk source simulation with discrepancy about ±1%.