radiothorium
/ˌreɪdioʊˈθɔriəm/
noun
- A radioactive isotope of thorium, used in scientific research and sometimes in medical treatments.
- Scientists study radiothorium to understand radioactive decay chains.
- The lab safely stored radiothorium in a lead-lined container.
- Radiothorium was once used in luminous paint for watch dials.