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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. 2015.
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Examples from the web for thorium series
  • Examples of important naturally occurring decay series include the uranium series, the thorium series, and actinium series.
  • The principal exposure is to gamma radiation from decay of the uranium or thorium series of heavy elements.
  • Environmental radon contamination typically results from radioactive decay of isotopes in the uranium-thorium series.
  • The majority of these can be grouped into the uranium series, the actinium series, and the thorium series.
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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