radioactivity
spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
Other meanings
The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.
Synonyms
- radiation
Related words
- nonradioactivity
Where this comes from
This definition is adapted from “radioactivity” on Wiktionary, by its contributors; related-word lists use Open English WordNet (CC BY 4.0, based on Princeton WordNet), published under CC BY-SA 4.0. This page is published under the same licence.