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Isomers

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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


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