| 释义 |
Definition of thorium in English: thoriumnoun ˈθɔːrɪəmˈθɔriəm mass nounThe chemical element of atomic number 90, a white radioactive metal of the actinide series. （化学元素）钍（符号： Th ） Example sentencesExamples - All natural rocks contain small amounts of uranium and thorium, which are radioactive and remain so for billions of years.
- Deep within Earth, some diamonds come into contact with radioactive materials, such as thorium or uranium, that can impart a unique signature known as a radiation halo.
- In addition to primeval heat, Earth's core also gets heat from radioactive decay of uranium, thorium, and potassium.
- The analysis shows that manganese, titanium, hafnium, thorium, phosphorus, and the rare-earth elements play a significant role in discriminating between zircons of various origins.
- The concentrations of iron and thorium, for instance, have proved useful in distinguishing rock types from one another and in monitoring geochemical processes.
OriginMid 19th century: named after the god Thor. Definition of thorium in US English: thoriumnounˈTHôrēəmˈθɔriəm The chemical element of atomic number 90, a white radioactive metal of the actinide series. （化学元素）钍（符号： Th ） Example sentencesExamples - The analysis shows that manganese, titanium, hafnium, thorium, phosphorus, and the rare-earth elements play a significant role in discriminating between zircons of various origins.
- The concentrations of iron and thorium, for instance, have proved useful in distinguishing rock types from one another and in monitoring geochemical processes.
- All natural rocks contain small amounts of uranium and thorium, which are radioactive and remain so for billions of years.
- Deep within Earth, some diamonds come into contact with radioactive materials, such as thorium or uranium, that can impart a unique signature known as a radiation halo.
- In addition to primeval heat, Earth's core also gets heat from radioactive decay of uranium, thorium, and potassium.
OriginMid 19th century: named after the god Thor. |