Abstract
A gamma–gamma fast –slow coincidence spectrometer composed of two 3"×3"NaI(Tl) detectors and peripheral electronics is used in investigating some effects on the photo peak after the penetration of gamma –rays from lead. Coincidence measurements are carried out using Na-22 source with selecting the 511 keV gate. Linear and mass attenuation (in cm²/g) coefficients measurements are made using lead sheets with dimensions 10×10 cm. Mass attenuation coefficient was measured for coincidence spectrum at 511 keV and found to be 0.114 and 0.140 for direct spectrum. Also coincidence and direct spectra measurements were carried out using Co-60 source with 1332 and 1173 keV gates. Mass attenuation coefficient at 1173 keV was 0.0460 for coincidence spectrum and 0.0522 for direct spectrum. At 1332 keV the same coefficient was0.0432 for coincidence spectrum and 0.0452 for direct spectrum. Mass attenuation coefficients values from coincidence measurement are lower than those in direct measurement at same energies
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