An optimum sample thickness of (0.5rμxr5.0) was selected in this experiment on the basis of the Nordfors criteria (Limkitjaroenporn et al., 2011). To measure mass attenuation coefficient, the sample was placed between the scattering rod and NaI(Tl) detector, and detection of the scattered gamma rays photopeak through sample at different angles was acquired by MCA. Integrated count rates were determined from Gaussianfits and used to determine an attenuation coefficient.