radiothorium
noun
ra·dio·tho·ri·um
ˌrā-dē-ō-ˈthȯr-ē-əm 
: a radioactive isotope of thorium with the mass number 228
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“Radiothorium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radiothorium. Accessed 22 Dec. 2024.
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radiothorium
noun
ra·dio·tho·ri·um
-ˈthōr-ē-əm, -ˈthȯr-
: a radioactive isotope of thorium with the mass number 228
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