Raman microprobe, ICP, and XRF techniques have been applied to characterize the solids precipitated from HNO3 solutions containing Zr and Mo under different solution conditions. The saturation yields of precipitation decrease linearly—in almost all cases—with increasing acid strength, and nearly complete precipitation of Mo occurs in 3-M HNO3 solutions; ionic strength does not seem to affect the yields. Raman spectra of the microparticles indicate that hydrated zirconium molybdate is the main product, except in solutions with large excess of Mo relative to Zr. Identification of the species formed in these solutions is made by comparison of the Raman spectra with the spectra of known compounds. X-ray diffraction patterns of hydrated and thermally treated zirconium molybdate are in accord with the reported crystallographic data.
ZusammenfassungDie Bestimmung des Abbrandes von Kernbrennstoffen aus schnellen Reaktoren durch die massenspektrometrische Isotopenverdün-nungsanalyse des 148 Nd kann vereinfacht werden. Anders als im thermischen Reaktor ist der Neutroneneinfang des 149 Sm vernachlässigbar, so daß eine Störung des Indikatorisotop ««Nd durch das isobare 1S0 Sm auszuschließen ist. Dies zusammen mit dem höheren Abbrand und dem größeren Plutoniumgehalt erlaubt eine direkte massenspektrometrische Messung des Uran, Plutonium und Neodym ohne vorherige chemische Trennung. Das Analysenverfahren wird beschrieben und die Genauigkeit der Methode belegt.
AbstractThe burn up determination of fast reactor fuels by mass spectrometric isotope dilution analysis of 148 Nd can be simplified. In contrary to thermal reactors is the neutron capture of 149 Sm négligeable, which eleminates any interference of the spike isotope ls0 Nd with the isobaric ls0 Sm. This together with the higher burn up and plutonium content makes a direct mass spectrometric measurement of Uranium, Plutonium and Neodynium possible without any chemical separation. The procedure and the accuracy of the method are given.
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