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: 47

Answer

Most of the energy comes from plutonium because it is produced when U-238 absorbs neutrons.

Work Step by Step

This is discussed on page 644, under the topic of breeder reactors.
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