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Half-life is constant over the lifetime of an exponentially decaying quantity, and it is a characteristic unit for the exponential decay equation.

The accompanying table shows the reduction of a quantity as a function of the number of half-lives elapsed.

All living things on Earth are made up of a high percentage of an element called carbon.The carbon in their bodies at the time of their death will remain in their bodies until they decompose, or if they become fossilized, then forever. This allows scientists to look at the amount of decay in a fossil’s radioactive carbon and determine a relative date.Radiocarbon dating is only effective for objects and fossils that are less than 50,000 years old.However, scientists can look at the decay of other elements in these objects allowing them to date them up to 2.2 billion years.) is the time required for a quantity to reduce to half its initial value.If you’d like to contribute something additional to pay for the scientists’ time, you can do so by writing in an additional amount.