actinium
noun [ U ] uk/ækˈtɪn.i.əm/ us/ækˈtɪn.i.əm/
(symbol Ac)锕
a chemical element that is a soft, silver-white metal and is radioactive
Researchers are testing the actinium. 研究者正在测试锕。
- More examples
- Thorium decays into a radium isotope, and then into actinium, which has a 10-day half-life.
- Projected future needs for actinium and bismuth are high.
- Various alternative processes have been proposed for making actinium.