Practical application of lead triple spiking for correction of instrumental mass discrimination

  title={Practical application of lead triple spiking for correction of instrumental mass discrimination},
  author={Stephen J. G. Galer and Wafa Abouchami},
  journal={Mineralogical Magazine},
The external precision of Pb isotope ratio measurements by TIMS is currently limited to ~0.1% due to variations in instrumental mass discrimination. It was shown by Dodson (1963) that the unknown mass discrimination factor could be obtained from a second measurement on an aliquot of a sample to which a double spike has been added. From the three isotope ratios measured on the two runs it is straightforward to solve for the three unknowns the respective fractionation factors of the two runs and… Expand

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