Table 2.

Estimated calculated values of the attenuation corrections for the Lamperti and Ritz FACs for Xoft Axxent sources operated at 50 kV. These estimates are based on the use of renormalized photoelectric-absorption cross sections (see text) and an air density for reference conditions (T = 22 °C and P = 101.325 kPa). The uncertainties are the standard deviations of results from the analysis of 34 spectra.

	katt	Relative Standard Uncertainty, %	(μ/ρ)eff	Relative Standard Uncertainty, %
Lamperti FAC	1.0087	0.11	1.85	13.2
Ritz FAC	1.0283	0.36	1.83	13.1