Theoretical references used:

• http://www-cxro.lbl.gov/optical_constants/
  B.L. Henke, E.M. Gullikson, and J.C. Davis, X-ray interactions: photoabsorption, scattering, transmission, and reflection at E=50-30000 eV, Z=1-92, Atomic Data and Nuclear Data Tables Vol.54 (no.2), 181-342 (July 1993)
• http://www.bmsc.washington.edu/scatter/periodic-table.html
  ftp://ftpa.aps.anl.gov/pub/cross-section_codes/
  S. Brennan and P.L. Cowan, A suite of programs for calculating x-ray absorption, reflection and diffraction performance for a variety of materials at arbitrary wavelengths Rev. Sci. Instrum. 63, 850-853 (1992)
• http://physics.nist.gov/PhysRefData/FFast/Text/cover.html
  http://physics.nist.gov/PhysRefData/FFast/html/form.html
  C. T. Chantler, Theoretical Form Factor, Attenuation, and Scattering Tabulation for Z = 1 - 92 from E = 1 - 10 eV to E = 0.4 - 1.0 MeV J. Phys. Chem. Ref. Data 24, 71-643 (1995)
• http://physics.nist.gov/PhysRefData/Xcom/Text/XCOM.html
  J.H. Hubbell, Photon Cross Sections, Attenuation Coefficients and Energy Absorption Coefficients from 10 keV to 100 GeV, Natl. Stand. Ref. Data Ser. 29 (1969). J.H. Hubbell, Photon Mass Attenuation and Mass Energy-Absorption Coefficients for H,C,N,O,Ar and Seven Mixtures from 0.1 keV to 20 MeV, Radiat. Res. 70, 58-81 (1977).
• http://ixs.csrri.iit.edu/database/programs/mcmaster.html
  http://cars9.uchicago.edu/~newville/mcbook/
  W. H. McMaster, N. Kerr Del Grande, J. H. Mallett, and J. H. Hubbell Compilation of X-Ray Cross Sections Lawrence Livermore National Laboratory Report UCRL-50174 Section II Revision I (1969) available from National Technical Information Services L-3, U.S. Dept. of Commerce