Separation and mass spectrometry of nanogram quantities of uranium and thorium from thorium-uranium dioxide fuels

Mass spectrometric determination of burnup of thorium-uranium dioxide fuel

“…(c) Separation with a Tributyl Phosphate Impregnated Resin Bead. For some of the fuel samples an alternative method (15) was used to extract U and Th. The dissolver solution was diluted to 16 mg/mL Th in 0.08 M HF/6 M HN03 and an aliquot was equilibrated with an XAD-2 resin bead that had been impregnated with tributyl phosphate.…”

“…(d) Mass Spectrometry. The mass spectrometry of U arid Th has been described elsewhere (15); briefly, the filament assembly was inserted in the source and the center filament was heated to 1700 °C for U isotopic analysis and then to 1900 °C for Th. Twenty to thirty replicate isotopic analysis were completed for each element.…”

“…Furthermore, Th is much more difficult to ionize than U, due to its refractory nature and higher ionization potential. Consequently mass spectrometry of Th and U was investigated in detail and is the topic of a separate paper (15).…”

Measurement of uranium isotopes in human tissue samples by TIMS

“…For this application, the solution was applied directly to the anion-exchange membrane, as the distribution coefficient for U in nitric acid solutions would have only resulted in approximately 5% uptake of the available U following equilibration with the solution. 8 Since only femtogram to picogram amounts of U isotopes were present in many of the samples, direct application of half of the sample was required to maximize the amount of analyte loaded onto the filament. The anion exchange membrane is similar to the resin bead loading technique, resulting in enhanced U ionization efficiency by providing a reducing environment and point-source geometry.…”

Yttrium (III) Selective Electrode Based On Zirconium (IV) Phosphoborate

“…Lanthanides are widely distributed in low concentration throughout the earth's crust and are being used for various applications in electronic gadgets and other materials of daily use. Trace level determination of yttrium is being carried out by various analytical techniques such as neutron activation analysis [1], mass spectrometry [2] X-ray fluorescence [3], spectrophotometric [4], voltametric and amperometric techniques [5,6]. These methods are either time consuming, need expert technical manpower and involve multiple sample manipulations, or are too expensive.…”