actinium series

noun Chemistry.
the radioactive series that starts with uranium 235 and ends with a stable isotope of lead of mass number 207.

1955–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actinium series
a radioactive decay series that starts with uranium-235 and ends with lead-207

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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