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Rb-Sr

Rb substitutes for K, Sr for Ca

Rb-87 Sr-87 Half Life 50 b.y.

Problem: Primordial Sr-87

But there is also Sr-86

If there’s no Rb-87, Sr-87/Sr-86 is constant

If there is Rb-87, Sr-87/Sr-86 increases

Also Rb-87 decreases

Plot on isochron diagram

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