Journal of Applied Physical Science International

The narrow collimated beam transmission method has been employed to take up the γ-ray attenuation studies of γ-photons of different energies on Na halides. The Na halide pellet has been irradiated with γ-rays of four different energies emitted by radioactive sources A NaI(TI) scintillation detector with resolution of 8.5% for 0.662MeV of ¹³⁷Cs  has been used as detector to detect the photons transmitted by the sample.  Mass attenuation coefficients (μ_m) for NaCl, NaBr, NaF and NaI pellets were determined experimentally for each energy. With the help of mixture rule the values of theoretical mass attenuation coefficients of alkali halides have been evaluated. Other remaining photon interaction parameters were calculated using the experimental and theoretical values of mass attenuation coefficients obtained. The experimental values of photon interaction parameters for Na halides are reported for the first time. The experimental values determined are compared with the calculated values and with X-COM values. They are in good agreement.