A $60$Co$60$Co source with activity $15\mathrm{.}6$ CiCi is embedded in a tumor that has a mass of $0\mathrm{.}510$ kgkg$.$ The CoCo source emits gamma$-$ray photons with average energy of $1\mathrm{.}25$ MeVMeV. Half the photons are absorbed in the tumor, and half escape.

Part A

What energy is delivered to the tumor per second?

Express your answer in jouls per second.

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EE $=$

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J$/$sJ$/$s

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Part B

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

Express your answer in rads.

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DD $=$

nothing

radrad

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Part C

What equivalent dose $($in remrem$)$ is delivered per second if the RBE for these gamma rays is $0\mathrm{.}700?$

Express your answer in rem.

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nothing

remrem

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Part D

What exposure time is required for an equivalent dose of $200$ remrem $?$

Express your answer with the appropriate units.

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tt $=$

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