noun
- a radioactive isotope of thorium with mass number 228, formed in the decay series of thorium-232
Usage: chemistry; physics
Examples
- Radiothorium has a half-life of approximately 1.9 years.
- The decay of radiothorium produces radium-224.
- Scientists studied the radioactive properties of radiothorium in the laboratory.
- Radiothorium is part of the thorium decay chain.
- The sample contained traces of radiothorium along with other isotopes.