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A collimated gamma ray beam consists of equal numbers of 0.1 MeV and 1.0 MeV photons....

A collimated gamma ray beam consists of equal numbers of 0.1 MeV and 1.0 MeV photons. If the beam enters a 8 cm thick lead shield, what is the relative portion of 1 MeV photons to 0.1 MeV photons in the emergent beam? State the source of all values used

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