Radiocarbon dating using electrostatic accelerators: negative ions provide the key.

@article{Bennett1977RadiocarbonDU,
  title={Radiocarbon dating using electrostatic accelerators: negative ions provide the key.},
  author={Charles L. Bennett and R. P. Beukens and M. R. Clover and Harry E. Gove and R B Liebert and A. E. Litherland and K. H. Purser and W E Sondheim},
  journal={Science},
  year={1977},
  volume={198 4316},
  pages={508-10}
}
Mass spectrometric methods have long been suggested as ways of measuring (14)C/(12)C ratios for carbon dating. One problem has been to distinguish between (14)N and (14)C. With negative ions and a tandem electrostatic accelerator, the (14)N background is virtually absent and fewer than three (14)C atoms in 10(16) atoms of (12)C have been easily measured. 

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