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thorium series

noun, Chemistry.
the radioactive series that starts with thorium and ends with a stable isotope of lead of mass number 208. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for thorium series

thorium series

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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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