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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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Evolution: Education and Outreach

ISSN: 1936-6434

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