X-ray microanalysis of thin foil Al-Ag alloys

Abstract
Measurements have been made of the intensity of Al and Ag X-rays generated from thin foils of Al alloys containing up to 22 wt.% Ag, using both wavelength and energy dispersive spectrometers and for electrons of energy between 45 and 100 keV. The intensity ratio I(Ag)/I(Al) would be expected to be constant with thickness but was found to increase up to six-fold for very thin foils. This anomaly prevents quantitative high resolution electron probe microanalysis using thin foils of this alloy.