Carbon Isotopes - Search
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  1. Natural isotopes

    There are three naturally occurring isotopes of carbon: 12, 13, and 14. C and C are stable, occurring in a natural proportion of approximately 93:1. C is produced by thermal neutrons from cosmic radiation in the upper a… See more

    Paleoclimate

    C and C are measured as the isotope ratio δ C in benthic foraminifera and used as a proxy for nutrient cycling and the temperature dependent air–sea exchange of CO2 (ventilation). Plants find it easier to use the lighter isoto… See more

    Tracing food sources and diets

    The quantities of the different isotopes can be measured by mass spectrometry and compared to a standard; the result (e.g., the delta of the C = δ C ) is expressed as parts per thousand (‰) divergence from the ratio of a standard: … See more

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