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Text File  |  1992-09-01  |  337b  |  10 lines
  1. Dark-grey, naturally radioactive metal,
  2. widely distributed throughout the world in
  3. minerals, such as monazite beach sands;
  4. symbol Th, atomic number 90, atomic weight
  5. 232.05. Discovered by Berzelius 1828, it has
  6. a half-life of 1.39 x 10^10 years, and its
  7. greatest potential use is breeding
  8. uranium-233, a fuel for nuclear power
  9. reactors.
  10.