Fundamental coefficient method applied to a quasi‐monochromatic excitation

The fundamental or effective influence coefficients are derived from the theoretical fluorescence intensities. For a monochromatic excitation, the calculations are simplified and do not require the spectral intensity distribution of the x‐ray tube. The use of the fundamental coefficient method applied to a quasi‐monochromatic excitation is illustrated by a practical application of the analysis of stainless steel and a high‐temperature alloy. The measurements were made with an energy‐dispersive spectrometer.