Author : B. Kadhem, A.
Engineering and Technology Journal,
2010, Volume 28, Issue 5, Pages 1001-1013
An efficient Monte Carlo computer program for simulation and calculation of the
total and full energy peak efficiency (absolute and intrinsic) of the cylindrical
NaI(Tl)detector (with different: volumes, source-detector separation and gamma rays
energies) is described. All the fundamental physical processes (photoelectric effect,
compton scattering effect and pair production effect) occurring inside the detector are
taken into account. Very fast analytical expressions for the absorption coefficients are
obtained. The same program can be used to calculate the response function of the
detector to gamma ray. The results show quite well agreement with experimental data
and with other calculations within error rate less than 2%. The results can be used in
gamma spectroscopy and determining the activity of sources.