Answer
D
Work Step by Step
The answer is D because it will take approximately 252 years for Ti to decay underground.
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Chapter 12 - Module 36 - Nuclear Energy Resources - AP Review Questions - Page 425: 5
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