radioisotope.

An isotope with an unstable nucleus that releases radiation as it decays.

Use it for

Words that belong together

• short-lived radioisotope
• medical radioisotope

On the page

The sensor used a small sealed radioisotope source.

Usage notes

Primary category: sci-fi. Forms: Singular radioisotope; plural radioisotopes. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: description, technology. Commonness: uncommon.