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Showing 1 to 16 of 16 for “"Neptunium"”.
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Neptunium-237 Production in Generation IV Reactors Spectra
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Recovery of neptunium in the modified purex process
Thesis: M.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1979
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Long-term desorption behavior of uranium and neptunium in heterogeneous volcanic tuff materials
Uranium and neptunium desorption were studied in long-term laboratory experiments using four well-characterized volcanic tuff cores collected from southeast of Yucca Mountain, Nevada. The objectives of the experiments were to 1. Demonstrate a methodology aimed at characterizing …
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The sorption of uranium(VI) and neptunium(V) onto surfaces of selected metal oxides and alumosilicates studied by in situ vibrational spectroscopy
… present study, the speciation of uranium(VI) and neptunium(V) at environmentally relevant mineral – water interfaces of oxides of titania, alumina, silica, zinc, and alumosilicates has been investigated by the application of attenuated total reflection Fourier-transform infrared (ATR FT-IR) …
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The distribution and history of nuclear weapons related contamination in sediments from the Ob River, Siberia as determined by isotopic ratios of Plutonium, Neptunium, and Cesium
… reveal that the majority of plutonium and neptunium (80 to 90 percent) behaves in a similar fashion regardless of the source and is removed by treating the sediments with citrate-dithionite. This indicates that plutonium and neptunium are not truly refractory and likely associate with redox …
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The distribution and history of nuclear weapons related contamination in sediments from the Ob River, Siberia as determined by isotopic ratios of Plutonium, Neptunium, and Cesium
This thesis addresses the sources and transport of nuclear weapons related contamination in the Ob River region, Siberia. In addition to being one of the largest rivers flowing into the Arctic Ocean, the bulk of the former Soviet Union's nuclear fuel reprocessing and weapons testing facilities …
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Optical Spectroscopy for Process Monitoring of 238Pu Production
… preparation will allow efficient processing of neptunium and plutonium and lowering of resource consumption. Design of experiment and multivariate analysis will be used to optimize calibration procedures for the Raman instrument in the system. While both organic and aqueous phases are of …
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Determination of actinide elements in environmental samples by ICP-MS
… of the transuranic actinide elements neptunium, plutonium and americium, resulted in the successful determination of 239Pu and 237Np in biological reference materials. Detection limits were 700, 850, and 600 attograms (ag) for 237Np, 233Pu, and 241Am, respectively, for a 0.5 ml sample …
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1,2–Dithiolate Complexes of the Lanthanides and Actinides and High– Pressure Studies of f–Element Complexes
… by finishing the trans–uranic actinide series neptunium to californium of mellitate complexes by characterizing two neptunium mellitate polymers and allows for a broad comparison of the bonding differences between the actinide and lanthanide series for the series of mellitate compounds. This …
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Multipoles, Magnetic charges and chiral properties in antiferromagnetic materials inferred from resonant X-Ray diffraction
… been investigated in detail by means of REXS. Neptunium Dioxide (NpO2), where an enigmatic low-temperature ordering state shows interesting physical features, similar to the one observed in UO2, that relates its crystal field, the super-exchange interactions and electron¿phonon coupling. …
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Structural and thermodynamic properties of sodium actinide ternary oxides
… group $\textit{Fmmm}$. The valence states of the neptunium cations were confirmed from the isomer shift values of their Mössbauer spectra. Having established the charge states without ambiguity, XANES spectra were collected at the $Np-L_3$ and $Pu-L_3$ edges to serve as reference data for An(V), …
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Chromatographic Separation of Metals
… nuclei), and gamma rays. Minor actinides such as neptunium, americium, curium, berkelium, californium, einsteinium, and fermium are the actinide elements in irradiated nuclear fuel other than uranium and plutonium; they are minor as they represent a very small proportion of actinides in comparison …
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Transuranic Imidophosphorane Chemistry
Since 2019, the La Pierre group has introduced multiple new molecular oxidation states to for the lanthanide series, namely Tb4+, Pr4+, and Pr5+. This was achieved through strategic ligand development, where these imidophosphorane ligands helped to substantially cathodically shift the redox couples …
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Zum Komplexbildungsverhalten ausgewählter Actiniden (U, Np, Cm) mit mikrobiellen Bioliganden
… die α-strahlenden Actiniden Uran, Curium und Neptunium ausgewählt, weil diese auf Grund ihrer Langlebigkeit und Radiotoxizität von besonderem Interesse sind. Diese Arbeit beschäftigte sich mit der Wechselwirkung der Actiniden U(VI), Np(V) und Cm(III) mit Modellliganden, die die …