METHOD FOR MEASURING SAFE LEVELS OF BULK MATERIAL

摘要

The invention relates to a method for measuring safe levels of bulk material containing radionuclides. The bulk material is placed on a conveyor belt and is supplied to an intake by means of the conveyor belt, wherein during transport the bulk material passes by first detectors which spectrometrically measure gamma radiation across the width of the conveyor belt. In order to carry out an exact determination of the radioactivity during high throughput, the following method steps are provided: - determination of the ratio of radionuclides in the bulk material prior to placement on the conveyor belt, taking into account at least one reference nuclide, - calculation of the radioactivity of the bulk material on the basis of the gamma rays and their intensities as measured by means of the first detectors, taking into account one or more of the reference nuclides present in the radionuclides, -checking the previously determined radionuclide ratio and/or the measured radioactivity by means of second detectors which measure α- and/or β radiation and which are arranged above the conveyor belt.