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Table of Contents -- radiothorium
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WORDNET DICTIONARY
CIDE DICTIONARY
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radiothorium

 : 
Noun
 : 
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WORDNET DICTIONARY

Noun radiothorium has 1 sense

CIDE DICTIONARY

radiothoriumn. 
     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.  [PJC]
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