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thorium series

noun, Chemistry
1.
the radioactive series that starts with thorium and ends with a stable isotope of lead of mass number 208.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thorium-series

thorium series

noun
1.
a radioactive series that starts with thorium-232 and ends with lead-208
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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