In a vacuum, an electron and positron at rest in close proximity will produce bremsstrahlung radiation, but classical treatment is only valid when they are far apart. As their initial distance decreases, quantum electrodynamics (QED) must be used to describe their interactions, especially when their total mass-energy approaches that of an electron or their distance is comparable to their Compton wavelengths. The total energy radiated during annihilation reactions depends on their initial potential energy, and different scenarios yield varying results. The positronium system, which consists of an electron and positron, has a total mass-energy less than that of its individual particles due to binding energy. The discussion ultimately highlights the complexities of measuring radiation emissions and the limitations of classical concepts in quantum contexts.