thorium-228
English Thesaurus
1. radioactive isotope of thorium with mass number 228 (noun.substance)
| hypernym | : | atomic number 90, th, thorium, |
| definition | : | 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 (noun.substance) |
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