Question: If the half value layer for iron is (1.7 mathrm{~cm}) for (1.332 mathrm{MeV}) photons and the exposure rate from a source is (1000 mathrm{mR} /

If the half value layer for iron is $1.7 \mathrm{~cm}$ for $1.332 \mathrm{MeV}$ photons and the exposure rate from a source is $1000 \mathrm{mR} / \mathrm{h}$, calculate

(a) $\mu\left(\mathrm{cm}^{-1}ight)$,

(b) the thickness of iron required to reduce the exposure rate to $100 \mathrm{mR} / \mathrm{h}$, and to $1 \mathrm{mR} / \mathrm{h}$.

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