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The Mossbauer line broadening method for the determination of Lamb-Mossbauer factors f LM cannot be applied directly in the determination of the probability of the resonant absorption f LM for single-crystalline absorbers with quadrupole splitted Mossbauer spectra. The line width Γ exp for single crystals with quadrupole splitted Mossbauer spectra has been computed for various absorber thicknesses. The polarization effects are important and have been taken into account. The linear dependence has been adapted for Lamb-Mossbauer factor measurements by introducing a polarization-dependent coefficient. This method has been tested on measurements of guanidinium nitroprusside (GNP) (CN 3 H 6 ) 2 [Fe(CN) 5 NO] single crystals.