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Thorium-228

noun

Definitions

Noun
  1. 1
    A radioactive isotope of thorium, ²²⁸₉₀Th, having a half-life of 1.9 years; it occurs naturally in small amounts, as member of the thorium-232 decay chain. uncountable
  2. 2
    radioactive isotope of thorium with mass number 228 wordnet

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