Patent ID: 7356114

Claim:
An X-ray fluorescence spectrometer for analyzing a coating weight of and an in-depth average composition of a coating while a galvanneal sheet steel having the coating of an in-depth inhomogeneous composition is used as a sample, which spectrometer comprises: an X-ray source for irradiating the sample at a predetermined angle of incidence with primary X-rays, and a detecting device for measuring an intensity of fluorescent X-rays generated from the sample at a predetermined angle of detection; wherein with two combinations of the angle of incidence and the angle of detection, in which combinations the angles of incidence and/or the angles of detection are different from each other, each intensity of the fluorescent X-rays is measured, and the angle of incidence and the angle of detection in each of the combination are so set that with respect to a measurement depth represented by the coating weight, at which the intensity of the fluorescent X-rays attains a value equal to 99% of the uppermost limit when the coating weight of a target coating to be measured is increased, respective measurement depths in the two combinations is a value greater than the coating weight of the coating.