(Solution) - The quantity of a radioactive material is often measured by -(2025 Original AI-Free Solution)

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The quantity of a radioactive material is often measured by its activity (measured in curies or millicuries) rather than by its mass. In a brain scan procedure, a 70-kg patient is injected with 20.0 mCi of 99mTc, which decays by emitting ?-ray photons with a half-life of 6.0 h. Given that the RBE of these photons is 0.98 and only two-thirds of the photons are absorbed by the body, calculate the rem dose received by the patient. Assume all of the 99mTc nuclei decay while in the body. The energy of a gamma photon is 2.29 × 10-14 J.