noun
A series of radioactive elements that starts with actinium and ends with lead-206, including actinium, thorium, protactinium, uranium, and various isotopes of these elements.
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The actinium series is a radioactive decay chain that starts with the element actinium-227.
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Did you know about the actinium series and how it decays over time?
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Yo, the actinium series is like a chain reaction of radioactive elements.
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The actinium series can be compared to a domino effect, with each element decaying into the next.