Meanings
nounthorium-228 (uncountable)
- uncountablenatural sciencesA 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.
Synonyms: radiothorium
Synonyms & antonyms
nounA 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.
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More synonyms by meaning
nounradioactive isotope of thorium with mass number 228
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Synonym sets from Open English WordNet, CC BY 4.0.
Cite this entry
APA
thorium-228. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/thorium-228
MLA
“thorium-228.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/thorium-228. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “thorium-228,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/thorium-228.
Source: thorium-228 on Wiktionary, CC BY-SA 4.0.