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nouna soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
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Definition that contains thorium
- at a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
- pitchblende a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
- atomic number 85 a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
- astatine a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
- radiothorium radioactive isotope of thorium with mass number 228
- thoriate impregnate with thorium oxide to increase thermionic emission
- thorite a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite
- thorium-228 radioactive isotope of thorium with mass number 228
- monazite a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
- uraninite a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore