A cobalt-60 source with activity 2.60×10^-4Ci is embedded in a tumor that has mass 0.20kg .The source emits gamma photons with average energy of 1.25 MeV. Half the photons are absorbed in the tumor, and half escape. I. What energy is delivered to the tumor per second? Ii. What absorbed dose ,in rad, is delivered per second? III. What equivalent dose ,in rem , is delivered per second if the RBE for these gamma photons is 0.70?
A cobalt-60 source with activity 2.60×10^-4Ci is embedded in a tumor that has mass 0.20kg .The source emits gamma photons with average energy of 1.25 MeV. Half the photons are absorbed in the tumor, and half escape. I. What energy is delivered to the tumor per second? Ii. What absorbed dose ,in rad, is delivered per second? III. What equivalent dose ,in rem , is delivered per second if the RBE for these gamma photons is 0.70?
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A cobalt-60 source with activity 2.60×10^-4Ci is embedded in a tumor that has mass 0.20kg .The source emits gamma photons with average energy of 1.25 MeV. Half the photons are absorbed in the tumor, and half escape.
I. What energy is delivered to the tumor per second?
Ii. What absorbed dose ,in rad, is delivered per second?
III. What equivalent dose ,in rem , is delivered per second if the RBE for these gamma photons is 0.70?
IV. What exposure time is required for an equivalent dose of 200 rem?
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