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Question: 

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

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$1.78 \times 10^9 \textrm{ Bq}$

Giancoli 7th Edition, Chapter 30, Problem 53

(3:60)

Chapter 30, Problem 53 is solved.

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