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Published online by Cambridge University Press: 06 March 2019
An energy-dispersive x-ray fluorescence method has been developed for the direct determination of major and minor elements in infinitely thick samples of paint. Matrix absorption and enhancement corrections are iteratively calculated from a knowledge of tabulated fundamental parameters and the unknown weight fractions. An estimate of the significant light element fraction of the bulk sample required for the calculation of matrix attenuation is obtained using the scatter peaks of the silver secondary target. Relative elemental calibration constants and calibration factors for the coherent and incoherent peaks are determined experimentally using either thin-film standards or standards of known total composition. For routine analysis only one absolute standard is required. The method has been applied to different types of paint with a relative standard deviation better than 5% provided the counting statistics are not the limiting factor. The accuracy has been tested by comparing own results with those obtained either from the formulation or from, instrumental neutron activation analysis.