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    What is the difference between electron-positron annihilation and gamma decay? They both emit gamma rays right?
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    Electron - positron annihilation produces a gamma ray. A gamma ray "decay" is where a nuclear decay happens to produce a gamma ray. i.e. there is some kind of situation, probably in the nucleus, that produces a gamma ray as part of the product of a decay. The way you worded it, it seems to imply a gamma ray "decayed" which could happen when a positron electron pair is produced.
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    (Original post by mystreet091234)
    What is the difference between electron-positron annihilation and gamma decay? They both emit gamma rays right?
    The other answer posted is correct, but also:

    Annihilation produces two photons while gamma decay only produces one.
 
 
 
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