A point source of photons of energy (1.0 mathrm{MeV}) is giving a dose of (10 mathrm{mR} /

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A point source of photons of energy \(1.0 \mathrm{MeV}\) is giving a dose of \(10 \mathrm{mR} / \mathrm{h}\) at a dose point \(P\). How much thickness of lead (density \(11 \mathrm{~g} / \mathrm{cc}\) ) is to be provided in between source and dose point \(\mathrm{P}\) if the dose rate has to be reduced to be \(1 \mathrm{mR} / \mathrm{h}\). Take the buildup factor to be 1.4 .

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