A method for measuring free of bulk material

The invention relates to a method for enabling measurement of radionuclides containing bulk material which is fed onto a conveyor belt and fed by means of the conveyor belt a receptacle, wherein the bulk material is passed during the transport of first detectors which measure spectrophotometrically over the width of the conveyor belt gamma radiation. This allows an accurate determination of the radioactivity with a high throughput, the method steps are provided: determination of the ratio of the radionuclides in the bulk material before application on the conveyor belt in consideration of at least one nuclide, calculation of the radioactivity of the bulk material on the basis of the first means of the detectors measured gamma rays and their intensities taking into account one or more of radionuclides present in the nuclides check the previously determined Radionuklidverhaltnisses and / or the measured radioactivity using α- and / or β-radiation measuring second detectors.