*presented at the 2nd Australian Symposium on Analytical Chemistry, Sydney, May 1973.
Abstract: The conversion of X-ray fluorescence intensities to concentrations by a mini-computer requires simple equations for routine use. The influence coefficients, accounting for inter-element effects in homogeneous samples, are calculated from fundamental parameters by means of a program called ALPHAS operating on a large computer. These coefficients can subsequently be used in the simple routine equations for wide range calibrations using multiple regression analysis. The number of required standards is significantly reduced. The exclusive use of theoretical influence coefficients is demonstrated for stainless steel.