I am interested, where Unruh radiation is hidden in quantum
electrodynamics? How Feynmans graphs assign Unruh radiation? Of course,
it is clear that acceleration in quantum electrodynamics is not
uniform.

Electron accelerates and radiates, for instance, in examples of Compton
effect and in electrical field of nucleus. It is known that this
radiation is consequence of acceleration of the charge, not
acceleration of mass. Classicaly, power of radiation is proportional to
fourth power of »Unruh« mass accelerations, but to square of charge
acceleration. So acceleration of charge and Unruh acceleration are not
the same.

Regards