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How are positrons related to electrons?
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The harmful effects of radiation from nuclear bombing.
A positron is the antiparticle of an electron. The two particles share the same mass and magnitude of electric charge, but they possess opposite chargesāthe electron is negatively charged, while the positron is positively charged.12
Their relationship is defined by several key physical processes:
- Annihilation: When a positron and an electron collide, they undergo annihilation, disappearing and converting their mass into energy in the form of gamma rays.34
- Pair Production: Conversely, through pair production, high-energy electromagnetic radiation can materialize into an electron-positron pair, demonstrating the direct conversion of energy into matter.54
- Positronium: Due to their opposite charges, they can briefly form a bound system known as positronium before they annihilate.34
This relationship is fundamental to particle physics and is utilized in medical technologies such as positron emission tomography, which detects the gamma rays produced when positrons emitted by a radioactive source annihilate with electrons in the body.62