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6. What percentage of 500 kv photons will pass through an iron barrier with a 2.5 cm thickness. Show all solutions: (5points) 7. A radionuclide emits 500 kV photons is sealed within a shielding container. The cylindrical container is wrapped with 30mm of Pb and 10mm of Cu. Assuming that the radionuclide emitted 1,000,000 photons, how many photons will be detected outside the container. Show all solutions: (Spoints)