Recoilless fraction determination by internal standard

Novel method of determination recoilless fraction in the transmission geometry is proposed. To avoid difficult problem of extraction of the non-resonant radiation, the α-Fe reference was used as an internal standard for the intensity scale. In order to reduce correlations between parameters fitted to measured spectra, at least three standard measurements have to be carried out. The results of measurements performed on FeSi absorbers with thicknesses varying by more than one order of magnitude demonstrate that proposed procedure correctly reconstructs non-linear dependence of the intensity on the sample thickness.