A prototype expert system for automated interpretation of wavelength d
ispersive X-ray fluorescence spectra is described. The system consists
of two main components: a pre-processor (PREXRF) written in BASIC and
a knowledge handling part (INFERXRF) that contains the knowledge base
and the inference engine implemented in PROLOG. Both systems rely hea
vily on the theory of fuzzy sets in an attempt to deal with incomplete
and uncertain information. The performance of the interpretation syst
em for automated analysis of simulated and measured samples is demonst
rated.