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RADIOTHORIUM - Definiția din dicționar

Traducere: română


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ra`di*o*tho"ri*um (r&ā;`dĭ*ŏ*th&ô;r"&ē;*ŭm), n. (Chem.) 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]