Click on any button with element name to get its x-ray properties. If you give an energy value in the box at the top of the table then you also get x-ray cross-sections at that energy. The original subroutine (mucal.f or mucal.c) used to calculate x-ray cross-sections is available from here.
Calculations are based on data compiled by W. H.McMaster et. al. Compilation of X-ray Cross-Sections, National Bureau of Standards, for calculation of x-ray cross sections.
Fluorescence yield data by M. O. Krause J. Phys. Chem. Ref. Data. 8, 307(1979)