Cesium 137 dating wiki

As an example, the radioactive decay of carbon-14 is exponential with a half-life of 5,730 years.

On the other hand, the time it will take a puddle to half-evaporate depends on how deep the puddle is.

The number at the top is how many half-lives have elapsed.

Note the consequence of the law of large numbers: with more atoms, the overall decay is more regular and more predictable.

This is an example where the half-life reduces as time goes on.

(In other non-exponential decays, it can increase instead.) The decay of a mixture of two or more materials which each decay exponentially, but with different half-lives, is not exponential.

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