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Contamination and fractionation effects in AMS-measured (super 14) C/ (super 12) C and (super 13) C/ (super 12) C ratios of small samples.

Cees Alderliesten, Klaas van der Borg, Arie M d


In AMS measurements on small (m< or =400 mu g) carbon samples, an m-dependence has been noted for the (super 14) C/ (super 12) C and (super 13) C/ (super 12) C ratios that is due to the combined effect of contamination and fractionation. A simple formalism is presented to describe the phenomena and to correct measurements on unknowns for their effect.


size;C 14 C 12;graphitization;isotope ratios;accelerator mass spectroscopy;mass spectroscopy;spectroscopy;chemical fractionation;sample preparation;C 14;carbon;isotopes;radioactive isotopes;C 13 C 12;stable isotopes;absolute age

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