On the question of the verification of the MCNP6.2 simulation program for the NaI(Tl) detector.

In this research, the Monte Carlo simulation software MCNP6.2 version was used to create an extremely precise mathematical model of the 2.5 x 3.8 cm NaI(Tl) detector. The NaI(Tl) detector's energy resolution curve and photon detection efficiency were measured using a gamma energy range of 53 to 1408 keV with various radioactive sources. Experimental efficiency values and simulation results for MCNP were consistent. However, experimental and simulated data for low photon energy revealed a discrepancy in terms of efficiency. This would be indicated by the internal attenuation of low photon energies. This work demonstrated that the MCNP6.2 software can be effectively employed to compute the energy resolution and FWHM of a 2.5 x 3.8 cm cylindrical NaI(Tl) detector. Simulation models provide precise initial calculations for the design of each detector or scientific research equipment. The energy deposition and electron track curves indicate that the employed NaI(Tl) detector was adequately sized to detect almost all gamma energies emitted from the radioactive sources. [ABSTRACT FROM AUTHOR]