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21 June, 00:03

Radium-226 is a common isotope on earth, but it has a half-life of about 1620 years. given that earth is some 5 billion years old, why is there any radium at all?

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  1. 21 June, 00:33
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    Radium-226 is a daughter isotope and the result of the uranium radioactive decay.

    At each of their respective half-life cycles, Radium-226 and Astatine-218 are converted back and forth by transmutation.
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