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Radioactive solutions of 65 Zn and 241 Am were standardized within the frame of the CCRI (II)/BIPM key comparisons carried out recently in 2003. The activity concentrations (in Bqg −1 ) were determined using the 4π(proportional counter)-γ coincidence counting method with efficiency extrapolation. Liquid scintillation methods were also used for 241 Am activity determination...