zeta_ICP: Zeta calibration coefficient for LA-ICP-MS fission track...

In tobiste/laftr: Calculates the ages from LA-ICP-MS based fission track dating

Zeta calibration coefficient for LA-ICP-MS fission track dating

Description

Calibrate the ICP-session zeta factor using the number of spontaneous tracks, the area over which these were counted and one ore more U/Ca, U/Si or U-concentration measurements (in ppm) and their analytical uncertainties.

Usage

zeta_ICP(
  x,
  spotsize = 40,
  mineral = c("zircon", "apatite"),
  standard = c("Dur", "FCT"),
  tst,
  lambda = pkg.env$lambda[1],
  g = pkg.env$g,
  ...
)

Arguments

x	data.frame containing counts of spontaneous tracks, U concentrations, and the uncertainties of U concentrations
spotsize	the laser ablation spot size (diameter in micrometer)
mineral	Mineral of the standard, one of 'zircon' or 'apatite'
standard	Name of the standard, one of 'Dur' or 'FCT'
tst	(optional) two-column vector giving the true age and its standard error. overrides mineral and standard
lambda	(optional) decay constant
g	(optional) geometry factor (default: 0.5)
...	additional arguments

Value

list containing: two-element vector with the session zeta and its standard error

References

Hasebe, N., Carter, A., Hurford, A.J., Arai, S., 2009. The effect of chemical etching on LA-ICP-MS analysis in determining uranium concentration for fission-track chronometry. Geol. Soc. Lond. Spec. Publ. 324 (1), 37–46. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1144/SP324.3")}

Examples

data("standard")
zeta_ICP(standard, spotsize = 40, mineral = "apatite", standard = "Dur")

tobiste/laftr documentation built on Feb. 10, 2025, 11:10 p.m.