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radiothorium

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ra·di·o·tho·ri·um  (rd--thôr-m, -thr-)
n.
A radioactive isotope of thorium with mass number 228.
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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


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