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Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.
The methods work because radioactive elements are unstable and they are always trying to move to a more stable state.
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For example, uranium-lead dating can be used to find the age of a uranium-containing mineral.
It works because we know the fixed radioactive decay rates of uranium-238, which decays to lead-206, and for uranium-235, which decays to lead-207.
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This process by which an unstable atomic nucleus loses energy by releasing radiation is called radioactive decay.