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Nuclei of the same atomic number Z and mass number A, but with a different energy state and different physical half-life. Isomers of energy above the ground state are identified by appending ‘m’, ‘n’, ‘p’, or ‘q’ to the mass number. ([[ICRP Publication 107]], 2007)
''ICRP Glossary entry - June 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - June 2019'''
