noun
- A radioactive isotope of thorium (thorium-230) that occurs naturally in uranium ores and is used in scientific research and dating applications.
Usage: technical; chemistry; physics
Examples
- Ionium is a decay product of uranium-234 in natural uranium series.
- Scientists use ionium dating to determine the age of marine sediments.
- The presence of ionium in geological samples helps researchers understand radioactive decay chains.
- Ionium has a half-life of approximately 75,000 years.