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The isotopic composition of rubidism is ...

The isotopic composition of rubidism is `.^(85)Rb, 72%` and `.^(87)Rb 28%` is weakly radioactive and `.^(87)Rb, 28%`. `.^(87)Rb` si weakly radioactive and decays by `beta-` emission with a decay constant of `1.1xx10^(-11)` per year. A sample of the minearl pollucite was found to contain `450mg Rb` and `0.72 mg` of `.^(87)Sr`. Estimate the age of polluucite.

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The correct Answer is:
`5.18xx10^(8)` year
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