1-20 OF 20 RESULTS FOR

neptunium

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 August 2016
Clays and Clay Minerals (2016) 64 (4): 438–451.
... ) Interaction of neptunium and plutonium with humic substances and kaolinite . Pp. 141 – 216 in: Migration of Actinides in the System Clay, Humic Substances, Aquifer ( C.M. Marquardt , editor). FZKA 7407, Forschungszentrum Karlsruhe , Karlsruhe, Germany . Amayri , S. , Jermolajev...
FIGURES | View All (4)
Journal Article
Published: 01 November 2015
Mineralogical Magazine (2015) 79 (6): 1287–1295.
...Adam J. Williamson; Katherine Morris; Christopher Boothman; Kathy Dardenne; Gareth T.W. Law; Jonathan R. Lloyd Abstract Neptunium-237 will be present in radioactive wastes over extended time periods due to its long half-life (2.13 × 10 6 years). Understanding its behaviour under conditions relevant...
FIGURES | View All (4)
Journal Article
Published: 01 August 2015
Clays and Clay Minerals (2015) 63 (4): 262–276.
... materials, by virtue of their good retardation properties. Neptunium (Np) is one of the actinides which is considered in long-term scenarios due to its long-lived nuclide 237 Np ( t 1/2 = 2.1×10 6 y). Because neptunium sorption is heavily dependent on the experimental conditions, comparison of sorption data...
Journal Article
Journal: Clay Minerals
Published: 01 May 2013
Clay Minerals (2013) 48 (2): 411–422.
... exclusion and surface diffusion. SKB Technical Report 96-16 , Swedish Nuclear Fuel and Waste Management Company . Foti S.C. Freiling E.C. ( 1964 ) The determination of the oxidation states of tracer uranium, neptunium and plutonium in aqueous media . Talanta , 11 , 385 – 392...
FIGURES | View All (8)
Journal Article
Published: 01 December 2012
Mineralogical Magazine (2012) 76 (8): 3411–3423.
... ratios ( R D values) of uranium(VI), neptunium(IV), tin and zirconium onto aged NRVB samples were measured using the batch sorption technique. For all four elements, there was little difference between R D values for aged NRVB and those for untreated material. The most probable explanation...
FIGURES
Journal Article
Published: 01 November 2012
Vadose Zone Journal (2012) 11 (4): vzj2011.0142.
FIGURES | View All (9)
Journal Article
Published: 01 June 2012
Mineralogical Magazine (2012) 76 (3): 777–806.
... 22 5 2012 © 2012 The Mineralogical Society 2012 mineral–radionuclide interactions radioactive waste radionuclides solid-phase capture processes biogeochemistry environmental mineralogy uranium plutonium neptunium technetium caesium strontium T he nuclear fuel cycle...
FIGURES | View All (9)
Journal Article
Published: 01 August 2011
Mineralogical Magazine (2011) 75 (4): 2359–2377.
... © The Mineralogical Society 2011 nuclear fuel cycle nuclear waste nuclear waste forms actinides transuranium elements plutonium neptunium pyrochlore I thank The Mineralogical Society for the invitation and honour of presenting the Hallimond Lecture. This is an undeserved, but much cherished...
FIGURES | View All (6)
Journal Article
Published: 01 August 2010
American Mineralogist (2010) 95 (8-9): 1151–1160.
... and the neptunium end-member is a theoretical Np-studtite structure with Np 6+ replacing all U 6+ atoms. Due to the limited number of cations in the unit cell (4, limited by the computational expense of these calculations), the minimum amount of Np incorporated into the model structure is 25% of the actinyl sites...
FIGURES | View All (9)
Journal Article
Published: 01 February 2009
Vadose Zone Journal (2009) 8 (1): 158–166.
... 2 yr −2 is almost doubled. Transport of a conservative tracer, technetium ( 99 Tc), and a reactive tracer, neptunium ( 237 Np) was simulated for a scenario in which a constant-concentration source was released instantaneously from the fracture continuum grid blocks representing...
FIGURES | View All (7)
Journal Article
Published: 01 December 2008
The Canadian Mineralogist (2008) 46 (6): 1623–1645.
... topologies ressemblent à celles des composés analogues à U 6+ uranyle. Suite à un examen des polyèdres de Np 5+ et Np 6+ et considérant les paramètres mis à jour pour calculer les valences de liaison, nous proposons R o = 2.035 et b = 0.422 pour le Np 5+ . (Traduit par la Rédaction) Neptunium...
FIGURES | View All (12)
Journal Article
Published: 01 November 2007
American Mineralogist (2007) 92 (11-12): 1946–1951.
... 2006 © 2007 American Mineralogist 2007 Soddyite uranophane neptunium nuclear waste Yucca Mountain Geological disposal of nuclear waste poses a daunting range of scientific and engineering challenges ( Macfarlane and Ewing 2006 ). A repository should prevent a range...
FIGURES | View All (5)
Journal Article
Published: 01 June 2007
The Canadian Mineralogist (2007) 45 (3): 471–477.
... Association of Canada 2007 neptunium phosphate synthetic compounds crystal structure neptunyl phosphate sheets autunite group phosphate de neptunium composés synthétiques structure cristalline feuillets à phosphate et neptunyle groupe de l’autunite Compound KP1 is the Np 6...
FIGURES
Journal Article
Published: 01 April 2007
American Mineralogist (2007) 92 (4): 662–669.
... synthesized from a solution containing approximately 500 ppm Np 5+ . The crystal analyzed is shown as an inset, where the ablation track is apparent. From Burns and Klingensmith (2006) . Metaschoepite uranyl uranium nuclear waste geologic repository crystal structure neptunium...
FIGURES | View All (5)
Journal Article
Journal: Elements
Published: 01 December 2006
Elements (2006) 2 (6): 331–334.
FIGURES
Journal Article
Journal: Elements
Published: 01 December 2006
Elements (2006) 2 (6): 343–349.
... “mineralogy”? All of these questions can be repeated as we look beyond uranium to the crystal-chemistry and geochemistry of the transuranium elements, such as plutonium and neptunium. The journey has just begun. We thank David Sassani, Christophe Poinssot, and Ron Fleming for reviews of an early...
FIGURES | View All (7)
Journal Article
Journal: Elements
Published: 01 December 2006
Elements (2006) 2 (6): 357–364.
FIGURES | View All (9)
Journal Article
Journal: Elements
Published: 01 December 2006
Elements (2006) 2 (6): 351–356.
... for lengthy periods and thus improving the long-term performance of the repository. Here we discuss one very important radionuclide, 237 Np (half-life = 2.14 million years), and focus on mineralogical studies that probe the potential impact of uranyl minerals on neptunium mobility. © 2006...
FIGURES | View All (5)
Journal Article
Published: 01 July 2006
American Mineralogist (2006) 91 (7): 1089–1093.
...., Blaudeau, J.-P., and Bursten, B.E. ( 2001 ) Neptunium Redox Speciation. Radiochimica Acta , 89 , 17 –25. Burns, P.C. ( 1999 ) The Crystal Chemistry of Uranium. In P.C. Burns and R. Finch, Eds., Uranium: Mineralogy, Geochemistry and the Environment, 38, 23–90.Reviews in Mineralogy, Mineralogical...
FIGURES
Journal Article
Published: 01 June 1998
Clays and Clay Minerals (1998) 46 (3): 256–269.