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annihilation radiationUpon the collision of a particle and an anti-particle, e.g. electron and positron, these are "annihilated" as particles and the mass of these particles converted into energy. Electro [..]
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annihilation radiationThe radiation resulting when a positron from beta positive decay comes to rest. It encounters an electron, and they annihilate each other and convert their rest mass into two 0.51-MeV gamma rays emitted in exactly opposite directions. (05 Mar 2000)
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