thoron
noun
tho·ron
ˈthō(ə)r-ˌän, ˈthȯ(ə)r- 
: a heavy radioactive isotope of radon of mass number 220 that is formed as a decay product of thorium, decays by emission of an alpha particle, and has a half-life of less than a minute
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“Thoron.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/thoron. Accessed 16 Nov. 2024.
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