Definitions for radiothorium
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Princeton's WordNet
thorium-228, radiothorium(noun)
radioactive isotope of thorium with mass number 228
Wiktionary
radiothorium(Noun)
The radioactive isotope thorium-228
Citation
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"radiothorium." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/radiothorium>.

