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The nuclide 241Am decays by alpha emission to 237Np. Most of the decays (84.6%) populate the excited level of 237Np with energy of 59.54 keV. DigitalCoincidence Counting was applied to standardize a solution of 241Am byalpha-gamma coincidence counting with efficiency extrapolation. Electronicdiscrimination was implemented with a pressurized proportional counter and theresults were compared with two other independent techniques: LiquidScintillation Counting using the logical sum of double coincidences in a TDCRarray and Defined Solid Angle Counting taking into account activityinhomogeneity in the active deposit. The results show consistency between thethree methods within a limit of a 0.3%. An ampoule of this solution will besent to the International Reference System (SIR) during 2009. Uncertaintieswere analysed and compared in detail for the three applied methods.

Standardization of 241Am by digital coincidence counting, liquid scintillation counting and defined solid angle counting