Carbon 14 dating artifacts

This element is locked in tiny zircons within the granite. While it stays within the zircon for a period of time, being a very small atom, helium escapes the zircon within a few thousand years.

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Animals and people eat plants and take in carbon-14 as well.

When granite rock hardens, it freezes radioactive elements in place.

The most common radioactive element in granite is Uranium-238.

Co­smic rays enter the earth's atmosphere in large numbers every day.

For example, every person is hit by about half a million cosmic rays every hour.

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