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Spectral distribution from end window X-ray tubes

Today little information still exists on spectra profiles emitted by x-ray tubes, although the development of mathematical matrix correction procedures for x-ray fluorescence analysis showed the demand of the knowlegde of accurate spectral intensity distribution from x-ray tubes. In this paper we present measured spectral intensity distributions from end window x-ray tubes (Au, Rh, Cu and Cr anodes) typically used in wavelength and energy dispersive spectrometers. The spectral distribution of the x-ray tubes measured with an energy dispersive method allows to compare the experimental data of the continuous spectra of the x-ray tube to a semiempirical expression based on the Kramers’ law. Furthermore, the knowlegde of different x-ray lines contributes to the total x-ray spectral distribution.