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A method is proposed to use of the mixture of Uran oxide and non-activematrix (e.g., NaCl) and also potassium and lanthanum for determiningGe-detector efficiencies. The preparations containing of known amouts of the Uor K, or La were measured by means of the Ge-detector, which a efficiency curvehas been obtained through the reference solutions of 241Am, 109Cd, 57Co, 139Ce,137Cs, 60Co. Results the measurements were compared the activities of thepreparations calculated from mass of 235U, 238U, 138La, 40K in the samples, itsnatural abundance, half lives and intensities of gamma lines. Discrepancy ofthe activities in the energy range between 163 and 1461 keV does not exeed 7 %.For correct comparison of the activities the coefficients {\omega} werecalculated, which took into consideration a varied sorption of gamma-rays inwater and in mixture of the Uran oxide and matrix.

Using of the natural radioactive elements for determining Ge-detector efficiencies