What is a positron?

A positron is a subatomic particle that has the same mass as an electron but carries a positive charge. It is the antimatter counterpart to the electron, meaning that when a positron encounters an electron, they annihilate each other, producing gamma rays. Positrons are commonly used in medical imaging techniques such as positron emission tomography (PET) scans. They are also used in particle physics research to study the interactions of particles and forces at the subatomic level.