Dependence of albedo factors on mean atomic number for 662 keV gamma photons

The albedo factors (number, energy and dose) of the samples with various mean atomic number have been investigated at a scattering angle of 180°. Fourteen different samples in the mean atomic number range 9.743 ≤ Z‾ ≤ 83.00 were obtained with bismuth and cellulose powders by using dilution technique. Thus, albedo factors have been investigated in a wide atomic number range. The samples were irritated by 662 keV gamma rays emitted from a137Cs radioactive source. The scattered γ -rays were counted by an HPGe detector with active area of 200 mm2. It has been observed that albedo factors decrease with increasing mean atomic number. Also, there is a high correlation between albedo factors and mean atomic numbers. © 2019 Elsevier Ltd