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Atoms of both isotopes of carbon contain 6 protons.

Atoms of carbon-12 have 6 neutrons, while atoms of carbon-14 contain 8 neutrons.

The rate of decay (or half-life) of C14 was proven linear, allowing scientists to determine the approximate date of the expiration of a life form based on the amount of C14 remaining in the fossil.

Recently, it was suggested that the dates offered by radiocarbon dating are increasingly being distorted by external factors.

C) For the best possible precision, carbon isotopic compositions of gas components are done by conventional off-line methods consisting of chromatographic separation followed by combustion and dual-inlet isotope ratio mass spectrometry.

Reproducibility is generally 0.1 per mil or better.

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Carbon-12 and carbon-14 are two isotopes of the element carbon.

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