Question

How much of fusion energy is positron-electron annihilation?

Answer 1

During β+ decay, a proton is converted into a neutron and a positive beta particle or β+. This is called a positronand has the same mass as an but the opposite charge (positive). When anelectron and a positron collide an annihilation event occurs and gamma rays are produced.

Answer 2

The relevant  positron-electron annihilation states that the position-electron annihilation produces 1.02 MeV of energy.