Uranium, Plutonium and Caesium Isotopic Abundances in a Saline Matrix

Four different samples were provided in the NUSIMEP 5 campaign, each consisting of two 10 mL saline solutions containing 5 ppb uranium, in the range depleted to low enriched, and with the addition of 1 Bq plutonium or caesium (134Cs and 137Cs) in some samples. Thirty nine laboratories submitted results and received certified values in return. The results are presented in a series of graphs showing measurement methods and results relative to the certified values. The campaign has been successful in showing the ability of a variety of laboratories to measure the isotopic abundances or activity ratios in trace amounts of these elements in environmental samples.