49V Standardization by the CIEMAT/NIST LSC method

The sample preparation procedure for LSC standardization of a solution of 49VCl5 is described and the time stability of samples is analyzed in four commercial scintillators, HiSafe II™, HiSafe III™, Ultima-Gold™ and Insta-Gel® Plus. Acceptable stability was obtained in HiSafe III™ and Ultima-Gold™. A self-consistent procedure was developed and successfully applied to the determination of the activity concentration of 49V. The samples were standardized by the CIEMAT/NIST method to a combined uncertainty of 3.4% in the interval of figure of merit 1.2–2.5 (3H equivalent efficiency 40%–20%).