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A model of the bremsstrahlung produced by photoelectrons, Auger electrons, and Compton electrons arising in an irradiated specimen is proposed. Calculations have shown that the contribution of the Compton electron bremsstrahlung shows up for monochromatic primary radiation of high-energy photons. For the primary radiation of x-ray tubes, only the bremsstrahlung spectrum of photoelectrons and Auger electrons is significant. The factors affecting the proportions between these components are considered. The bremsstrahlung spectral distribution of the mentioned electrons shows considerable deviations from that predicted by the Kramers theory that are due to the large depth of their occurrence and to the ambiguity of their energy. The region of the spectrum has been determined where the intensity of the electron bremsstrahlung is greater than the intensity of the x-ray tube polychromatic primary radiation scattered by the irradiated object.

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The formation of a background signal in the X-ray fluorescence equipment based on the Soller and Johansson X-ray optics was considered. It was noted that the loss peak arising in the detector should be taken into account. It was proposed that the filtration of the amplitude spectrum coming from the detector to the recording system be used in the scheme with the Johansson crystal. In this method, the intensity of the analytical background can be reduced by several times at a constant level of the analytical signal.