Answer
Please see the work below.
Work Step by Step
We know that it will take Cesium 137 three times half life of 30.2y, or 90.6y to decay $\frac{1}{8}$ and its original mass is $1$ to $\frac{1}{2}$to $\frac{1}{4}$ to$\frac{1}{8}=3$ half lives.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 20 - Nuclear Chemistry - Questions and Problems - Page 867: 20.11
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