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Meaning of RADIOTHORIUM in English
  1. radioactive isotope of thorium with mass number 228
  2. An earlier name for the thorium isotope thorium-228, given by its discoverer otto hah 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 91 years. the name radiothorium was given prior to the full understanding of the nature of isotopes of elements.
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