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5. 200 kV photons in an incident beam will be attenuated by 1.5 mm of lead barrier. If there are 250,000 photons in the said beam.... How much photons will be left after it passes through the lead barrier. Show all solutions (5 points) TABLE 3.3b Linear attenuation coefficients of selected elements, cm-¹. Energy, Chromium Cobalt Copper Iron Magnesium Lead (Z = 82) Manganese (Z = 25) kV (Z = 24) (Z = 27) (Z = 29) (Z = 26) (Z = 12) 50 11.0 18.8 22.9 15.2 65.0 0.561 12.6 100 2.29 3.53 4.10 2.93 62.0 0.292 2.52 150 1.29 1.80 1.98 1.54 21.8 0.242 1.36 200 0.992 1.32 1.39 1.15 10.7 0.216 1.03 300 0.769 0.970 0.997 0.866 4.29 0.186 0.788 400 0.662 0.827 0.837 0.740 2.49 0.165 0.679 500 0.595 0.740 0.742 0.662 1.72 0.150 0.608 1000 0.426 0.524 0.471 0.798 0.109 0.435 0.334 0.524 0.0768 0.309 0.238 0.525 2000 0.302 0.374 0.374 4000 0.232 0.291 0.295 0.260 0.484 0.0548 6000 0.212 0.271 0.277 0.239 0.505 0.0467 10000 0.202 0.264 0.272 0.233 0.570 0.0399 15000 0.209 0.275 0.285 0.241 0.643 30000 0.231 0.311 0.327 0.219 0.211 0.0374 0.217 0.270 0.807 0.0369 0.243 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: (5points)