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Systems that have been exploited for radiometric dating have half-lives ranging from only about 10 years (e.g., tritium) to over 100 billion years (e.g., Samarium-147).However, in general, the half-life of a nuclide depends solely on its nuclear properties and is essentially a constant.It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

The final decay product, lead-208 (208Pb), is stable and can no longer undergo spontaneous radioactive decay.

In many cases, the daughter nuclide is radioactive, resulting in a decay chain.

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