Validation for monte carlo simulation of characteristics of gamma spectrometer using HPGe GMX35P4-70 detector by MCNP5 and GEANT4 codes

Tóm tắt

The study used two Monte Carlo simulation codes of MCNP5 and GEANT4 to simulate HPGe detector of GMX35P4-70, then its response spectra and peak efficiencies characteristics were evaluated. The results show that when increasing the inner dead layer thickness of the detector from 1.8mm to 2.2mm, there is a better fit of the response spectra and the peak efficiencies characteristics compared with the measured ones. In general, it is useful to use two these input files to simulate response spectra and calculating the peak efficiency of GMX detector for determination of radionuclide distribution in the soil by in situ or laboratory gamma-ray spectrometry.