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A beam of gamma rays has a cross-sectional area of 2.0 cm2 and carries 7.0 x 10^8 photons through the cross-section each second. Each photon has an energy of 1.25 MeV. The beam passes through a 0.75 cm thickness of flesh (r = 0.95 g/cm3) and loses 5.0 percent of its intensity in the process. What is the average dose (in Gy and in rd) applied to the flesh each second? |
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