Directly using the Monte Carlo program to simulate the source-less efficiency of HPGe detectors takes long time to run.This paper studies and tests a source-less efficiency algorithm based on numerical integration,which can be applied to the source-less efficiency calibration of point sources and volume sources.On the basis of ensuring that the efficiency calibration deviation is not more than 10％,the single efficiency calibration operation time is reduced from approximately 180 seconds when directly simulated to less than 10 seconds,achieve a breakthrough in the calibration efficiency of HPGe detectors.
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