thorium series

noun Chemistry.
the radioactive series that starts with thorium and ends with a stable isotope of lead of mass number 208.
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thorium series
 
n
a radioactive series that starts with thorium-232 and ends with lead-208

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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