Radiothorium

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A radioactive isotope of thorium with mass number 228.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. The radioactive isotope thorium-228
    • the GNU version of the Collaborative International Dictionary of English
  • n. an earlier name for the thorium isotope thorium-228, given by its discoverer Otto Hahn. It is a radioactive substance formed as one of series of products in the chain of radioactive decay of thorium. Its immediate predecessor in the chain is Actinium-228, and it decays by alpha emission to radium-224 with a half-life of 1.91 years. The name radiothorium was given prior to the full understanding of the nature of isotopes of elements.
    • The Century Dictionary and Cyclopedia
  • n. A radio-element produced by the disintegration of thorium and intermediate between mesothorium, of which it is a product, and thorium emanation, of which it is the parent. It closely resembles thorium in its chemical properties, and was discovered by Hahn in 1905.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. radioactive isotope of thorium with mass number 228
    • Hypernym
    Words that are more generic or abstract
    thorium    atomic number 90    Th   
    Variant
    thorium-228   
     
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