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The neutron diffraction method of texture determination yields information concerning the orientation distribution function of the volume of crystallites. The scattered intensity depends not only on the irradiated volume, but also on the crystallographic perfection of crystallites and on the angular disorientation between them. Therefore, when the texture of coarse-grained materials like grain-oriented silicon steels is determined using neutron diffraction, the measurements are affected by errors due to the extinction phenomenon within individual grains. Additionally, the anisotropy of grain shape induces orientation variations of the intensity of the diffracted beam. To investigate the influence of extinction on texture measurements, neutron diffraction data have been collected for a composite 3% Si-Fe sample with different degrees of lattice perfection. A correction is proposed to eliminate the effects of the orientation dependence of grain size and extinction on texture measurements.