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In alpha decay, the nucleus of an atom of atomic number Z and mass number A emits an alpha particle (<sup>4</sup>He nucleus) to form an atom of atomic number Z-2 and mass number A-4
(Adapted from [[ICRP Publication 107]],2 0072007)
''ICRP Glossary entry - May 2019'' '''Return to [[ICRP Glossary|Glossary]] entry - May 2019'''