Multi-method of standardization of radionuclides with “triangular scheme” of disintegration

The new system of absolute methods of measurement of activity is presented in the paper. This system could be named a new generation of methods particularly for standardization of radionuclides with “triangular-scheme” of disintegration. The system is based on multi-parametric coincidence and anti-coincidence 4π(LS)-γ methods. Theoretical considerations and experimental data of 51Cr-activity measurement using the above methods are presented. Finally, determination of the uncertainty for all the components in the multi-method system and the overall uncertainty for the system is presented.