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Evolution: Education and Outreach
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Table 1 Common radioactive elements and their half-lives
From:
How Old is Earth, and How Do We Know?
Radon-222
3.8 days
Carbon-14
5,730 years
Potassium-40
1.248 billion years
Uranium-238
4.468 billion years
Rubidium-87
47 billion years
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