The relativistic photoelectric cross section for the two electrons of the K shell has been computed using a numerical program. The four elements Z=26,50,84 and 92 have been treated in the energy range of light quanta from 300 keV to 1.23 MeV. The results for the cross section are lower than for the unscreened Coulomb potential by an amount which ranges from approximately 7% at 354 keV, for $Z=26$, to 2.2% at 1.23 MeV, for $Z=92$.
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Hall et al. (1966) studied this question.
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