单词	thorium
释义	thorium /ˈθɔːrɪəm / noun [mass noun] The chemical element of atomic number 90, a white radioactive metal of the actinide series. (Symbol: Th) In addition to primeval heat, Earth's core also gets heat from radioactive decay of uranium, thorium, and potassium.... All natural rocks contain small amounts of uranium and thorium, which are radioactive and remain so for billions of years. 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. Origin Mid 19th century: named after the god Thor.
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