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Carbon-14 breaks down into Carbon-12 at a measurable rate. All the Carbon-14 in an object is fixed once it is finished(or dead) and then it begins to decay. So to determine the age you need to know(or guess) what the ratio of 14 to 12 was to begin with and see how much Carbon-14 is degraded to get the age.

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Related Questions

Can radiocarbon dating be used to determine the age of pottery?

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