The intensifying effect of metallic screens on the sensitivity of xhyphen;ray films at 662 keV

摘要

The relative photographic effect of electrons originating from 662hyphen;keV photons interacting in aluminum, copper, and lead foils was measured as a function of the foil thickness. Intensification factors on the sensitivity of Kodak AA xhyphen;ray films of up to 5.5, 4.6, and 8.7 were determined for aluminum, copper, and lead, respectively. The equilibrium thicknesses for back screens were found to be 40, 65, and 110 mg/cm2, respectively. For front screens, the equilibrium thickness is 110 mg/cm2in all cases. The results were compared with the absorbed dose in the filmrsquo;s emulsions, calculated by Monte Carlo methods and found to agree within 10percnt;.