Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 34 - Think and Explain - Page 654-655: 46


Only tiny amounts of plutonium occur naturally in U-238 deposits.

Work Step by Step

When U-238 captures a stray neutron, it turns into U-239, then becomes Np-239, then transforms into Pu-239. Plutonium has a relatively short half-life compared to U and Th, so much of it has decayed. This is discussed on page 643, in the Check Point.
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