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So, we see there are a number of different methods for dating rocks and other non-living things, but what if our sample is organic in nature?

For example, how do we know that the Iceman, whose frozen body was chipped out of glacial ice in 1991, is 5,300 years old?

They release radiation until they eventually become stable isotopes of lead.

These two uranium isotopes decay at different rates. The half-life of the uranium-238 to lead-206 is 4.47 billion years.

Carbon-14 is continually being created in the atmosphere due to the action of cosmic rays on nitrogen in the air.

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Free 5-day trial Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.

The uranium-235 to lead-207 decay series is marked by a half-life of 704 million years.

These differing rates of decay help make uranium-lead dating one of the most reliable methods of radiometric dating because they provide two different decay clocks.

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