[en] In radiometric sorting a method of eliminating errors in the count recorded by a detector for a given ore particle, which errors are due to radiation arising from one or more adjacent particles and picked up by the detector. The spacings between the adjacent particles and the given particles are determined and statistically determined calibration factors which are dependent on the spacings, and on the counts associated with the adjacent particles, and optionally on at least one of the shape, volume, mass or height of the adjacent particles, respectively, are applied to compensate the count for the given particle