[isotopes that decay and emit radiation; either naturally occurring elements or are produced by the action of neutrons, protons, deuterons, or alpha particles; index with a specific element when appropriate, e.g., C14 index with CARBON and RADIONUCLIDE. ( CSP )]
UMLS (NCI) C0034595 Relation/PAR: Element
Relation/CHD: actinide
radon
Tc element
H3 radionuclide