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So if you know the radioactive isotope found in a substance and the isotope's half-life, you can calculate the age of the substance.

Well, a simple explanation is that it is the time required for a quantity to fall to half of its starting value.

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.

However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.

There are different methods of radiometric dating that will vary due to the type of material that is being dated.

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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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