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Mar4-09, 08:54 AM
Sci Advisor
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P: 8,954
C14 is (according to wiki) about 1 ppt of C12, or 600billion atoms/mole of carbon.
The accurate ratio is hard to find because most standards work in terms of decay rate rather than proportion.
Be careful - most of the Carbon-Dating sites thrown up by google are young earth creationists or others trying to disprove carbon dating.