Several different elements can be used for this purpose.
Particular isotopes used in radiometric dating have half-lives which are relevant to either human civilization or geologic time scales.
I think you are asking about radiometric dating rather than specifically carbon dating.
Radiometric dating involves measuring the proportion of radioactive isotope to stable isotope of a specific element remaining in a sample of material.
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These radioactive elements constitute independent clocks that allow geologists to determine the age of the rocks in which they occur.
Atoms of radioactive isotopes are unstable and decay over time by shooting off particles at a fixed rate, transmuting the material into a more stable substance.
For instance, half the mass of carbon-14, an unstable isotope of carbon, will decay into nitrogen-14 over a period of 5,730 years. Study of the dependence of 198Au half-life on source geometry.
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