Method for developing HPGe detector model in Monte Carlo simulation codes

This paper describes a simulation model for a high-purity germanium (HPGe) detector by scanning the detector with a low-energy collimated source and calibrating the efficiency of the detector. The parameters of the initial simulation model, particularly the dead-layer thickness, were modified step by step according to the experimental results. The validity of codes, models, and methods was shown by implementing the model into the FLUKA and MCNPX codes and cross-checking against the experimental data. •A simulation model for a high-purity germanium (HPGe) detector was developed according to the experimental results.•The experimental procedure involved calibrating the efficiency of the detector and scanning it detector with a low-energy collimated beam.•Uniformity of the dead-layer thickness in the HPGe detector was examined along various surfaces using the scan results.•Good agreement was obtained between the measured and simulated results for the final simulation model.