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Abstract
The possibility of the most intensive gamma-peak of Np239 (106.1 keV) for epithermal neutron activation analysis (ENAA) of uranium is evaluated. A procedure for the peak area calculation of the partially overlapping peaks of Sm153 and Np239 is discussed. It proved to be suitable for determination of uranium in phosphate ore samples by the 106.1 keV peak of Np239 after epithermal irradiation using only one standard. The accuracy of the uranium determination is about 95% on average for the applied method.