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Physics 10 Online
OpenStudy (anonymous):

Carbon-14 has a half-life of 5730 years. If the age of an object older than 50,000 years cannot be determined by radiocarbon dating, then what ?

OpenStudy (jamesj):

We use the isotopic composition of the material for another element which has a longer half life. http://en.wikipedia.org/wiki/Radiometric_dating

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