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This method needs less than 1 mg of carbon and directly measures the abundance of the individual ions of carbon (14C, 12C and 13C).To obtain a radiocarbon age the sample activity or the 14C/12C ratio must be compared to a standard material of known age.

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The method is widely used by Pleistocene geologists, anthropologists, archaeologists, and investigators in related fields.Three isotopes of carbon are found in nature; carbon-12, carbon-13 and carbon-14.

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