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WORDNET DICTIONARY
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WORDNET DICTIONARY
Noun radiothorium has 1 sense
- radiothorium(n = noun.substance) thorium-228 - radioactive isotope of thorium with mass number 228; Array is a kind of atomic number 90, th, thorium
CIDE DICTIONARY
radiothorium, 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. [PJC]