Simple procedure for optimizing model of NaI(Tl) detector using Monte Carlo simulation

This study proposed a simple procedure for optimizing the model of NaI(Tl) detector. The procedure considers using linear functions for describing the dependence of efficiency on each specification of detector using Monte Carlo simulation. The measurements were performed to determine the efficiency of detector using point calibration sources. Using these efficiencies, the optimized specifications were interpolated based on the above linear functions. The validation of optimized model was carried out by experimentally determining the efficiencies of detector and estimating the radioactivities of K-40, U-238, and Th-232 isotopes in reference samples. The obtained results showed good agreement between experiment and simulation.