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

A 60Co60Co source with activity 15.2 CiCi is embedded in a tumor that has a mass of 0.515 kgkg. The CoCo source emits gamma-ray photons with average energy of 1.25 MeVMeV. Half the photons are absorbed in the tumor, and half escape.

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