(Answered) The entrance exposure during a mammography examination is

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The entrance exposure during a mammography examination is 100mR.

(a) Suppose the photon bean consists of photons each of energy 20 keV. How many photons are incident on a 1 cm^2 surface of breast tissue?

(b) Now suppose the energy of each photon is 50 keV. How many photons are incident on a 1 cm^2 surface of tissue?

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