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The doping method in quantitative X-ray diffraction phase analysis is described. The method involves the addition to the investigated system of known amounts of the components, the weight fractions of which are to be simultaneously determined. The weight fraction of a component is related to the intensities diffracted by that component and by any non-added component, before and after doping. The method can also be applied to systems containing unidentified components by analysing for only those components of interest, as well as for amorphous-content determination.