[en] The report describes the methods, the measurement systems, the correction procedures and the results. Generally the results of the coincidence method are in better agreement with the actual values. However the Pu values are systematically overestimated. This demonstrates that the correction procedures have to be improved and that methods for matrix identification are of great importance. For the pulsed neutron method the influence of sample self-shielding was demonstrated. It turned out that the correction procedure for the influence of matrix composition as used for the data evaluation is inadequate for neutron absorbers. This becomes important if just instead of hydrogeneous matrix materials such as PE foam real waste materials with a high PVC content are used. The measurements were done in the frame of a Round Robin Test Exercise on α-contaminated waste sponsored by the European Community (EC). The aim of the Exercise was a comparison of methods and equipment available in different laboratories in the EC for the nondestructive assay of α-waste drums. (orig./HP)