pyrolite.geochem.isotope

Submodule for calculation and transformation of mass spectrometry data (particularly for ion-counting and isotope ratio data). Currently in the early stages of development.

Todo

  • Dodson ratios 1

  • Add noise-corrected quasi-unbiased ratios of Coath et al. (2012) 2

  • Deadtime methods 3 4 5

  • Synthetic data, file format parsing

  • Capability for dealing with pyrolite.geochem.isotopeerence materials

    This would be handy for pyrolite.geochem in general, and could be implemented in a similar way to how pyrolite.geochem.norm handles pyrolite.geochem.isotopeerence compositions.

  • Stable isotope calculations

  • Simple radiogenic isotope system calculations and plots

  • U-Pb, U-series data reduction and uncertainty propagation

References

1

Dodson M. H. (1978) A linear method for second-degree interpolation in cyclical data collection. Journal of Physics E: Scientific Instruments 11, 296. doi: 10.1088/0022-3735/11/4/004

2

Coath C. D., Steele R. C. J. and Lunnon W. F. (2012). Statistical bias in isotope ratios. J. Anal. At. Spectrom. 28, 52–58. doi: 10.1039/C2JA10205F

3

Tyler B. J. (2014). The accuracy and precision of the advanced Poisson dead-time correction and its importance for multivariate analysis of high mass resolution ToF-SIMS data. Surface and Interface Analysis 46, 581–590. doi: 10.1002/sia.5543

4

Takano A., Takenaka H., Ichimaru S. and Nonaka H. (2012). Comparison of a new dead-time correction method and conventional models for SIMS analysis. Surface and Interface Analysis 44, 1287–1293. doi: 10.1002/sia.5004

5

Müller J. W. (1991). Generalized dead times. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 301, 543–551. doi: 10.1016/0168-9002(91)90021-H