Using Coltrims we have separated the contribution of Compton scattering from the process of photoabsorbtion (see here). In several experiment at Hasylab and ESRF we have measured the ratio for compton scattering in the photon energy range from 9keV(spielberger95prl) to 100keV.

Ratio of double to single ionization of Helium by Compton scattering.
For references see spielgerber98pra