I am trying to plot the transmission curve for aluminium with thickness of 15um for photon energies in the range of 10-10k eV
the database provided by NIST X-ray Attenuation Databases: https://physics.nist.gov/PhysRefData/XrayMassCoef/chap2.html
shows the mass attenuation coefficient for energies of 1k eV and higher. where can I find database for energies lower than 1k eV?