Part A

$A^{60}Co$ source with activity $15\mathrm{.}0$ Ci is embedded in a tumor that has a mass of $0\mathrm{.}490$ kg $.$ The Co source emits gamma$-$ray photons with average energy of $1\mathrm{.}25$ MeV $.$ Half the photons are absorbed in the tumor, and half escape.

What energy is delivered to the tumor per second?

Express your answer in jouls per second.

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Part B

What absorbed dose $($in rad$)$ is delivered per second?

Express your answer in rads.

$D=$ rad