If-the-initial-amount-of-Sr-is-known-or-can-be-ext -- Multiple sentences match

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If the initial amount of Sr is known or can be extrapolated, the age can be determined by measurement of the Rb and Sr concentrations and the 87 Sr / 86 Sr ratio.

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If the initial amount of Sr is known or can be extrapolated, the age can be determined by measurement of the Rb and Sr concentrations and the 87 Sr / 86 Sr ratio.

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