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How radioactive is actinium?

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Actinium-227, the most stable isotope, has a half-life of 21.6 years. The other seven isotopes of actinium have very short half-lives ranging from 10 days to less than 1 min.

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Similar questions: How many actinium isotopes are there? Who long are actinium's half-lives? How stable are actinium isotopes? How stable are the isotopes of actinium? How long are the half-lives of actinium? [ Hide these questions ]

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