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A 2mCi source of Co is placed in the center of a cylindrical water-filled tank with an inside diameter of 20cm and depth of 100cm.

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A 2mCi source of Co is placed in the center of a cylindrical water-filled tank with an inside diameter of 20cm and depth of 100cm. The tank is made of iron with a wall thickness of 1cm. What is the uncollided flux density (in cm2s1 ) at the outer surface of the tank nearest the source. Each decay of Co emits 2 photons with an average energy of 1.25MeY. Given PC= 0.4191cm1 and H2O=0.0632cm1

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