radiothorium


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radiothorium

(ˌraɪdɪəʊˈθɔːrɪəm)
n
(Chemistry) chem a radioactive isotope of thorium
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Noun1.radiothorium - radioactive isotope of thorium with mass number 228
atomic number 90, thorium, Th - a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands