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Radioactive decay is measured as a half life and it varies enormously. REALLY enormously! The shortest half life is for artificial elements where the half life is a few millionths of a second, the longest is hydrogen which has a half life of far longer than the lifetime of the universe!

Uranium has a half life of around 4000 million years; geologists use uranium (and other elements) to calculate the age of rocks based on how much of the uranium has decayed.

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