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In characteristic x-ray intensity calculations, the total L spectrum can be represented by separate spectra from L, , L, and L3 subshell transitions. The expressions presented here take into account the ionization not only of the L, , L, and L3 subshells but also of the K shell. The approximating polynomials for the calculation of the radiative transition probability and the Koster-Kroning transition probability are derived. Examples are presented of intensity calculations in multi-component systems using the TEREN program. Pl = PmJsin 4 ~2 = PLmifSin 111 4 = incidence angle of primary radiation; $ = emergence angle of the fluorescence radiation.

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A model for fluorescence radiation line intensity calculations with consideration of x-ray tube primary beam radiation divergence and actual sample bulk, from which fluorescence radiation is registered at the detector, is proposed. Expressions are provided for commercial instruments having extended and circular sources. These expressions are valid for the short-wavelength region of the spectrum and for substantial beam divergence, while the commonly used equations are invalid. P, = Pmi/sin $; cp = incidence angle of primary radiation; $ = emergence angle of the fluorescence radiation.