Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Explain - Page 635-636: 76

Answer

Radium is produced by uranium.

Work Step by Step

The chart in Figure 33.22 shows that radium is a "daughter" of uranium-238, which has a very long half-life of 4.5 billion years. Radium is continuously being made from the radioactive decay of uranium.
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