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The equation for half-life is ...

AT = A0 2 (-T/H)

... where A0 is the starting activity, AT is the activity at some time T, and H is the half-life in units of T.

There are other versions, but they all work out the same way. Using this version, with 2 as the base instead of e, makes it easier to remember.

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How do you calculate the age of a bone when half-life is known?

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The half-life of carbon-14 is 5370 years. The carbon-14 levels in a fossil indicate that 6 half-lives have passed. How old is the fossil?

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When was How the Other Half Lives created?

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