What is another word for actinium series?
Pronunciation: [aktˈɪni͡əm sˈi͡əɹiz] (IPA) 
The "actinium series" is a term often used in nuclear physics to describe the decay chain of radioactive actinium-227. Synonyms for this term include "actinium decay series," "actinium-227 series," and "radium series." All of these terms refer to the same process of radioactive decay, whereby actinium-227 decays into a series of intermediate isotopes before finally reaching a stable isotope of lead. These synonyms are useful for scientists and students who may be researching or studying the process of radioactive decay, and they serve to provide alternative ways of referring to the same phenomena.
