The relativistic theory of shakeoff of innershell electrons during β‐decay is reexamined. In the case of negative β‐decay a resolution of the discrepancy that existed between theory and experimental data has been achieved. This resolution comes about by considering the many‐body aspects of the problem, and the wave functions involved in the initial and final states have to be evaluated more precisely. In the case of electron capture shakeoff the agreement still leaves room for probing electron correlation. The glaring fault seems to be in the case of positron decay shakeoff, where the theoretical values are about half of the measured ones. A plausible argument is given to resolve this discrepancy by considering the positron‐ejected electron final state interaction.

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