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The matrix element of a bound electron interacting with the nucleus throughexchange of a Z boson is studied for the gauge invariant case of$2s_{1/2}-2p_{1/2}$ transitions in hydrogenic ions. The QED radiativecorrection to the matrix element, which is $-\alpha/2\pi$ in lowest order, iscalculated to all orders in $Z\alpha$ using exact propagators. Previouscalculation of the first-order binding correction are confirmed bothanalytically and by fitting the exact function at low $Z$. Consequences for theinterpretation of parity nonconservation in cesium are discussed.Comment: 20 pages, 4 figure

Radiative corrections to parity-nonconserving transitions in atoms