The 4πβ efficiency tracing liquid scintillation spectrometry method was applied with success, at ENEA, to the activity measurement of pure β- emitters (90Sr and63Ni) and electron-capturing nuclides (55Fe), using3H as tracer nuclide. The agreement of these measurements in comparison to other national metrology institutes was checked by means of two comparisons, carried out in 1996-1997. Furthermore a study of the stability of the prepared sources was performed and the dependence of the measured activity concentration on the quenching level was analysed. The radionuclides were standardised to a combined standard uncertainty of 0.14% for90Sr, 0.55% for63Ni and 1.18% for55Fe.
All Science Journal Classification (ASJC) codes
Ceccatelli, A., & De Felice, P. (1999). Standardisation of 90Sr, 63Ni and 55Fe by the 4πβ liquid scintillation spectrometry method with 3H-standard efficiency tracing. Applied Radiation and Isotopes, 51(1), 85 - 92. https://doi.org/10.1016/S0969-8043(98)00169-9