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5 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 tho·ri·um /ˈθoriəm, ˈθɔr-/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 tho·ri·um /ˈθorɪəm, ˈθɔr-/ 名詞

From: Webster's Revised Unabridged Dictionary (1913)

 Tho·ri·um n.  Chem. A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also thorinum. Symbol Th. Atomic weight 232.0.

From: WordNet (r) 2.0

      n : a 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 [syn: Th,
           atomic number 90]

From: Elements database 20001107

 Symbol: Th
 Atomic number: 90
 Atomic weight: 232.038
 Grey radioactive metallic element. Belongs to actinoids. Found in monazite sand
 in Brazil, India and the US.  Thorium-232 has a half-life of 1.39x10^10 years.
 Can be used as a nuclear fuel for breeder reactors. Thorium-232 captures slow
 neutrons and breeds uranium-233. Discovered by Jons J. Berzelius in