A narrow beam of 0.5 MeV photons is incident normally on a 3 mm iron slab. What fraction of the photons have an interaction in the slab? Mass attenuation coefficient of iron 0.08 cm/g, density of iron 7.87 g/cm O a. 0.828 O b. 0.172 Oc.0.58 O d. 0.42
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