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thorium series

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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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for thorium series

thorium series

noun
  1. a radioactive series that starts with thorium-232 and ends with lead-208
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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