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Parity nonconservation due to the nuclear weak charge is considered. Wedemonstrate that the radiative corrections to this effect due to the vacuumfluctuations of the characteristic size larger than the nuclear radius $r_0$and smaller than the electron Compton wave-length $\lambda_C$ are enhancedbecause of the strong electric field of the nucleus. The parameter that allowsone to classify the corrections is the large logarithm $\ln(\lambda_C/r_0)$.The vacuum polarization contribution is enhanced by the second power of thelogarithm. Although the self-energy and the vertex corrections do not vanish,they contain only the first power of the logarithm. The value of the radiativecorrection is 0.4% for Cs and 0.9% for Tl, Pb, and Bi. We discuss also how thecorrection affects the interpretation of the experimental data on paritynonconservation in atoms.Comment: 4 pages, 3 figures, RevTe

Parity nonconservation in heavy atoms: The radiative correction enhanced by the strong electric field of the nucleus