TY - GEN A1 - Tamberg, D. A1 - Thiele, D. A1 - Brodda, B. G. A1 - Lammertz, H. A1 - Coerdt, W. A1 - Mainka, E. A1 - Görgenyi, T. A1 - Stütz, A. A1 - Aigner, H. A1 - Deron, S. A1 - Kuhn, E. T1 - Evaluation of an interlaboratory comparison of the chemical assay of U, Th oxide coated particles PY - 1981 SN - 92-0-179081-3 N1 - Serientitel: IAEA safeguards – Series title: IAEA safeguards IS - 3 SP - 1 EP - 38 PB - IAEA CY - Wien AN - OPUS4-33362 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Thiele, D. A1 - Brodda, B.-G. A1 - Mainka, E. A1 - Görgenyi, T. A1 - Kuhn, E. A1 - Aigner, H. T1 - International Comparison of the Chemical Assay of Uranium and Thorium in THTR Fuel for Safegurards Purposes N2 - The Thorium High Temperature Prototype Reactor (THTR) at Schmehausen (Fed. Rep. Germany) burns a (Th, U)O2 nuclear fuel using 93% enriched uranium. This material is particularly safeguards sensitive. An interlaboratory test has been completed on the heavy metal determination in BISO type (Th, U)O2 particles. The laboratories involved were BAM, KFA, KfK, NUKEM and SAL (IAEA). The modified Davies and Gray titration was applied for uranium, oxalate precipitation followed by ignition to ThO2 and gravimetry for thorium. The exercise allowed an estimate to be made of the various error components: the results indicate that the sampling techniques applied in this experiment ensure a representativity of the sample of 0.05% or better. The precision of the measurements (1σ) is better than or equal to 0.15%. Assuming the overall means are the true values, the accuracy of the methods is better than or equal to 0.1%. This fulfills safeguards requirements. PY - 1983 SN - 0022-3115 IS - 113 SP - 142 EP - 148 PB - North Holland Publ. Co CY - Amsterdam AN - OPUS4-40817 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -