Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 24 - Problems - Page 1095: 24.46


See explanation below.

Work Step by Step

Given that the half-life of plutonium-239 is 2.41 x 10^4 yr. And given that seven half-lives are required to reach a tolerable level of radioactivity. So time 239 Pu can be stored is = 7 x half life = 7 x (2.41 x 10^4 yr) = 1.69 x 10^5 yr
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