thorium series

American

noun

Chemistry.

the radioactive series that starts with thorium and ends with a stable isotope of lead of mass number 208.

thorium series British

noun

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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thorium series

They are the uranium series, the actinide series, and the thorium series.

From Textbooks ● Feb. 14, 2019

Furthermore, in the thorium series 6 alpha particles are lost before reaching the end product, which again is perhaps the chemical analogue of lead.

From A Brief Account of Radio-activity by Francis Preston Venable

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023