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Symbolically, the process of radioactive decay can be expressed by the following differential equation, where N is the quantity of decaying nuclei and k is a positive number called the exponential decay constant.

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This depends on the decay of uranium-237 and uranium-238 to isotopes of lead.Another limitation is that carbon-14 can only tell you when something was last alive, not when it was used.A limitation with all forms of radiometric dating is that they depend on the presence of certain elements in the substance to be dated.To date older fossils, other methods are used, such as potassium-argon or argon-argon dating.

Other forms of dating based on reactive minerals like rubidium or potassium can date older finds including fossils, but have the limitation that it is easy for ions to move into rocks post-formation so that care must be taken to consider geology and other factors.

Carbon dating works on organic matter, all of which contains carbon.

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