Three radioactive sources have the same activity, 35 mCi. Source A emits 1.0-MeV rays, source B emits 2.0-MeV rays, and source C emits 2.0-MeV alphas. What is the relative danger of these sources? g g 38 90Sr 38 90Sr 38 90Sr
A 55-kg patient is to be given a medical test involving the ingestion of (Section 31–7) which decays by emitting a 140-keV gamma. The half-life for this decay is 6 hours. Assuming that about half the gamma photons exit the body without interacting with anything, what must be the initial activity of the Tc sample if the whole-body dose cannot exceed 50 mrem? Make the rough approximation that biological elimination of Tc can be ignored.
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