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A cobalt-60 source with activity 2.60×10-4 Ci is embedded in a tumor that has mas 0.20...

A cobalt-60 source with activity 2.60×10-4 Ci is embedded in a tumor that has mas 0.20 kg. The source emits gamma photons with average energy 1.25 MeV. Half the photons are absorbed in the tumor, and half escape.
i. What energy is delivered to the tumor per second? [4 marks]
ii. What absorbed dose, in rad, is delivered per second? [2 marks]
iii. What equivalent dose, in rem, is delivered per second if the RBE for these gamma rays is 0.70? [2 marks]
Page 5 of 7
iv. What exposure time is required for an equivalent dose of 200 rem? [2 marks]
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