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thorium dioxide
thorium series
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thoron
tho·ron
[
tháw ròn
]
noun
Definition:
radioactive isotope of radon:
a radioactive isotope of radon with a half-life of 55 seconds, formed by the radioactive decay of thorium
[
Early 20th century. <thorium, after radon
]
Encarta® World English Dictionary [North American Edition] © & (P)2007 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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