A clinical report reads: "Patient X received an effective dose of from the CT examination

PHYSICS · Multi-part · Fermi University Physics · Nuclear Physics · Biophysics & Medical Physics · Radiation interactions, detection and dosimetry

The Nucleus Resolved, Ch Dose: kerma, cavity theory, and what energy does to a cell

Problem

A clinical report reads: "Patient X received an effective dose of 12 mSv12\,\mathrm{mSv} from the CT examination. Applying the nominal risk coefficient of 5×10−2 Sv−15\times10^{-2}\,\mathrm{Sv^{-1}}, Patient X's individual probability of a fatal cancer from this scan is 12×10−3 Sv×5×10−2 Sv−1=6×10−412\times10^{-3}\,\mathrm{Sv}\times5\times10^{-2}\,\mathrm{Sv^{-1}} = 6\times10^{-4}, which should be recorded in Patient X's notes as their personal risk." ((a)) Find the error in this reasoning. ((b)) State what the calculated number 6×10−46\times10^{-4} actually represents, and classify each quantity used (effective dose, risk coefficient, the final product) as a measurement, an extrapolation, or a decision.

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