Positron Emission

• Positrons are positive electrons, anti-matter (0 e or β+)

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• When matter and anti-matter collide, they annihilate each other leaving only 2 gamma rays exactly opposite (180 degrees) that travel forever or until a collision.
• During positron emission, the nucleus has too few neutrons so a proton turns into a neutron and emits a fast-moving positron.