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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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