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U^(238) is found to be in secular equili...

`U^(238)` is found to be in secular equilibrium with `Ra^(226)` in its ore. If chemical analysis shown `1` atoms of `Ra^(226)` per `2.8xx10^(6)` atoms of `U^(238)`, find the half-like of `U^(228)`. Given the half life `Ra^(226)` is `1620` years.

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