The mass attenuation coefficients show no significant difference between the Cambodian and South African’s zircons for energies higher than 400 keV. However, at the energies lower than 400 keV the Cambodian’s zircon show the difference of the mass attenuation coefficient values with South African’s zircon.This is due to the different photoelectric interaction at gamma-ray energy lower than 400 keV between the two zircons as shown in