thorium-228

Definitions of thorium-228
  1. noun
    radioactive isotope of thorium with mass number 228
    synonyms: radiothorium
    see moresee less
    type of:
    Th, atomic number 90, thorium
    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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