Release of neptunium from neptunium-doped borosilicate waste glass.
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چکیده
منابع مشابه
Mössbauer stuties of neptunium fluorozirconate glass
— A new neptunium fluorozirconate glass (NpBasZrnF*) has been prepared and its Mossbauer spectrum was measured at 4.2 K and 77 K. Two resonance lines were observed. One is assigned to the Np ions occupying the normal Np sites in the compound. The other is thought to arise from Np which has replaced some of the Ba ions. The isomer shift of those ions suggests a configuration near 5f 6d . The Np ...
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Coprecipitation experiments of Np(V) and U(VI) with calcite were performed in mixed-flow reactors under steady state conditions at room temperature for up to 400 h at precipitation rates of 1.0 × 10-8 to 6.8 × 10-8 mol/(m2 s). The saturation index with respect to calcite varied between 0.04 and 0.95. Initial Np(V) or U(VI) concentrations were 1 μmol/L, 0.01 mol/L NaCl was used as background ele...
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The title compound, NpCuSe(2), is the first ternary neptunium transition-metal chalcogenide. It was synthesized from the elements at 873 K in an evacuated fused-silica tube. Single crystals were grown by vapor transport with I(2). NpCuSe(2) crystallizes in the LaCuS(2) structure type and can be viewed as a stacking of layers of CuSe(4) tetra-hedra and of double layers of NpSe(7) monocapped trig...
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In order to understand a crucial role of orbital degree of freedom in the magnetic structure of recently synthesized neptunium compounds NpTGa5 (T=Fe, Co, and Ni), we propose to discuss the magnetic phase of an effective two-orbital model, which has been constructed based on a j-j coupling scheme to explain the magnetic structure of uranium compounds UTGa5. By analyzing the model with the use o...
متن کاملMineralogic controls on aqueous neptunium(V) concentrations in silicate systems
The presence of radioactive neptunium in commercially spent nuclear fuel is problematic due to its mobility in environmental systems upon oxidation to the pentavalent state. As uranium is the major component of spent fuel, incorporation of neptunium into resulting U(VI) mineral phases would potentially influence its release into environmental systems. Alternatively, aqueous neptunium concentrat...
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ژورنال
عنوان ژورنال: Journal of Nuclear Science and Technology
سال: 1989
ISSN: 1881-1248,0022-3131
DOI: 10.3327/jnst.26.607