total and photo peak relative efficiency measurement for NaI[T1] detector

In the present work, total and photo peak relative efficiency were measured for NaI[T1]. Two radioactive sources [Co-60 and Cs- 137] with detector NaI[T1] by size [3 " x 3 "] were used. The range of angles [10 °-90 °] and the range of distance between the sources and crystal [10-30] cm. The experimental results show: When increasing the angle the photo peak relative efficiency increasing. And increasing it's the total relative efficiency increase until [50 °] after these angle the total efficiency decrease. The photo peak relative efficiency increasing with increasing and also the total relative efficiency same behavior

study of the effect of thickness scattered material on the backscattering photons in the energy spectrum of the NaI detector

Two radioactive sources [Co-60 and Cs-137] were used, also lead material with thickness [1-5 mm], was used to study the effective back scattered photons from shielding material. The ratio of scattering area to the total increase, until saturation thickness, and then these ratio will fix, while the ratio of photo peak to the total net photo peak to the total decreases. Until saturation thickness, and then these ratio will fix, for all distance used between radioactive sources and the NaI[T1] detector. But by increase the energy the saturation thickness increase