The Treatment of Efficiency of NaI(Tl) Detector By Using Monte Carlo Simulation

Abstract

An efficient Monte Carlo computer program for simulation and calculation of thetotal and full energy peak efficiency (absolute and intrinsic) of the cylindricalNaI(Tl)detector (with different: volumes, source-detector separation and gamma raysenergies) is described. All the fundamental physical processes (photoelectric effect,compton scattering effect and pair production effect) occurring inside the detector aretaken into account. Very fast analytical expressions for the absorption coefficients areobtained. The same program can be used to calculate the response function of thedetector to gamma ray. The results show quite well agreement with experimental dataand with other calculations within error rate less than 2%. The results can be used ingamma spectroscopy and determining the activity of sources.