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...arcz |first1=Henry P. |last2=Schoeninger |first2=Margaret J. |title=Stable isotope analyses in human nutritional ecology |journal=American Journal of Physical where the standard is an established [[Reference materials for stable isotope analysis|reference material]]. ...

...s by measuring the decay of [[carbon-14]] ({{chem|14|C}}), a [[radioactive isotope]] of carbon. Developed in the late 1940s, the technique has been widely use * [[Isotope fractionation]], where different carbon isotopes are absorbed at different ...