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Define alpha decay?...

Define `alpha` decay?

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The spontaneous process of emission of an a particle from a radioactive nucleus is called alpha decay.
`""_(Z)^(A)X to ""_(Z-2)^(A - 4)Y + ""_(2)^(4)He + Q`
`""_(92)^(238)U to ""_(90)^(234)Th + ""_(2)^(4)He + Q`
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