A 3 MeV point source of grams is located at the center of a 6.0 cm diameter
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Question:
A 3 MeV point source of grams is located at the center of a 6.0 cm diameter iron sphere. The lead sphere is surrounded by a spherical shell of lead 3 cm thick (The resulting sphere is a radius 6.0 cm).
a) What is the radius of the sphere in which half the gammas undergo a first interaction?
b) What fraction of the gammas undergo a first collision in the lead?
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