Abstract
It is demonstrated how data for internal-conversion coefficients may be decomposed with good accuracy into terms scaling with different powers of the atomic number. The individual terms are identified as a near-field contribution, a contribution due to photon emission and subsequent atomic photoionization, and interference. The photoeffect channel is generally important for high atomic numbers. The ratio of the photoeffect component to the near-field contribution is consistent with a localization of the relativistic photoeffect to distances from the nucleus not substantially exceeding the Compton wavelength of the electron irrespectively of atomic number and shell. Such localization is in accordance with results of an impact-parameter study. As a by-product a fitting formula is produced for electric dipole transitions involving the $K$ shell. The formula which is accurate to the level of $\ensuremath{\simeq}1%$ covers a variation of the conversion coefficient over nearly four decades.
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