Rubidium;strontium dating. The rubidium isotope a emitter

Chapter 30, Problem 53

(choose chapter or problem)

(II) Rubidium-strontium dating. The rubidium isotope \({ }_{37}^{87} \mathrm{Rb}\), a \(\beta\) emitter with a half-life of \(4.75 \times 10^{10} \mathrm{yr}\), is used to determine the age of rocks and fossils. Rocks containing fossils of ancient animals contain a ratio of \({ }_{38}^{87} \mathrm{Sr}\) to \({ }_{37}^{87} \mathrm{Rb}\) of 0.0260. Assuming that there was no { }_{38}^{87} \mathrm{Sr}\) present when the rocks were formed, estimate the age of these fossils.

Equation Transcription:

Text Transcription:

{ }_{37}^{87} Rb

beta

4.75 x 10^10 yr

{ }_{38}^{87} Sr

{ }_{37}^{87} Rb

{ }_{38}^{87} Sr

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