The procedure of radioactive standards preparation by spiking selected matrices with a certified mixture of radionuclides and its validation is presented in this paper. The uncertainty budget of standard total activity was elaborated in details. The experimentally obtained efficiency curves, as well as comparison with the curves obtained by the efficiency transfer, are presented. Additionally, in order to confirm claimed homogeneity of prepared standard bulk materials, the efficiency versus density dependence for the individual gamma ray energies was checked for the same geometries and the results are presented. The results of the participation in recent IAEA PT scheme are discussed also.

本文介绍了通过将经认证的放射性核素混合物加标到选定的基质上来制备放射性标准品的方法，并验证了其有效性。详细阐述了标准总活动的不确定性预算。介绍了实验获得的效率曲线，以及与通过效率传递获得的曲线的比较。另外，为了确认所要求的标准散装材料的均质性，对于相同的几何形状，检查了各个伽马射线能量的效率与密度的关系，并给出了结果。还讨论了参加最近的国际原子能机构PT计划的结果。