Question: A 6 0 C o source with activity 1 5 . 2 Ci is embedded in a tumor that has a mass of 0 .

A60Co source with activity 15.2 Ci is embedded in a tumor that has a mass of 0.490 kg . The Co source emits gamma-ray photons with average energy of 1.25 MeV . Half the photons are absorbed in the tumor, and half escape.
A 6 0 C o source with activity 1 5 . 2 Ci is

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