A multimethodic and multiparametric system for standardisation of radionuclides

A measuring system with simultaneous application of four independent counting methods for standardization of solutions of different radionuclides is presented. The result obtained using four methods allows for mutual verification and gives the final result with a higher confidence level. The multidetection scintillation head for 4π(LS)-γ coincidence and anticoincidence with double-parametric registration, as well as the electronic diagram, is described. The four methods, comprised in the presented system, are described. Using the multimethodic and multiparametric system, massic activity of the solutions of the following radionuclides with various decay schemes has been measured: 133Ba, 90Sr, 99Mo, 85Sr, 65Zn, 139Ce, 192Ir, 204Tl, 60Co, 241Am, 152Eu, 169Yb. The results of the methods were analyzed using the figure of merit evaluated following the ISO/IEC guide 47-1. The system seems to allow the analysis of the correctness of the extrapolation curves, activity vs. the LSC efficiency, applied in 4π(LS)-γ methods.