Method for assessing the concentration of uranium in a sample by gamma spectrometry, and associated device

A device for assessing a concentration of uranium in a sample of a uranium-bearing material, the sample having a density and a height, the device comprising:

• an acquisition module configured for acquiring an energy spectrum of gamma radiation of the sample by a detector, the energy spectrum comprising at least a first energy band between 87 keV and 110 keV, and a second energy band between 560 keV and 660 keV, the second energy band comprising a 609 keV energy line of 214Bi;
• a first calculation module configured for calculating an initial mass concentration of uranium by using an area of the first energy band, an area of the second energy band, and a net area of the 609 keV energy line of 214Bi;
• a measurement module configured for obtaining a measurement of a parameter that is representative of the height of the sample and a parameter that is representative of the density of the sample;
• a second calculation module configured for calculating a corrective coefficient, by using a parameter that is representative of the height of the sample, a parameter that is representative of the density of the sample, and the initial mass concentration of uranium calculated by the first calculation module;
• and
• a third calculation module configured for calculating a corrected mass concentration of uranium that is corrected by using the initial mass concentration of uranium and the corrective coefficient, each respectively calculated by the corresponding first calculation module and the second calculation module.