Radionuclide
An isotope of an element that decays or disintegrates spontaneously, emitting radiation. Approximately 3000 natural and artificial radioisotopes have been identified.
See: NORM, Nuclear medicine
Glossary Source
JRC EU CBRNe Glossary
(
EU Glossary on Chemical, Biological, Radiological, Nuclear, and Explosive risks
)
https://publications.jrc.ec.europa.eu/repository/bitstream/JRC128863/JRC128863_01.pdf