A study of the effect of Al2O3 reflector on response function of NaI(Tl) detector

• The study was conducted to verify the model of Monte Carlo simulation.
• The effect of Al2O3 reflector on the detector response function was investigated.
• The optimum thickness of Al2O3 reflector is suggested.

This study aims to assess the effect of Al2O3 reflector surrounding the NaI(Tl) crystal on the detector response function, based on Monte Carlo simulation, which can verify the precise model of the NaI(Tl) detector. The method used in determining the suitable thickness of Al2O3 reflector is to compare the calculated and experimental values of full-energy peak efficiency. The results show that the Al2O3 reflector should have a thickness of 0.8–1.2 mm for the maximum deviation between the experimental and simulated efficiency of 3.2% at all concerning energies. In addition, the obtained results are in good agreement with the response function of simulation and experimental spectra.