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technetium

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Journal Article
Published: 01 January 2017
Reviews in Mineralogy and Geochemistry (2017) 82 (1): 851–885.
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Journal Article
Published: 01 November 2015
Mineralogical Magazine (2015) 79 (6): 1379–1388.
... contaminants ( Hunter, 2004 ). In oxic environments, technetium is highly mobile in the form of its pertechnetate anion, TcO 4 − ( Burke et al. , 2005 ), and its half-life of 2.1 × 10 5 years ( Szecsody et al. , 2014 ) means that 99 Tc is particularly problematic. Hence there is a need for low...
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Journal Article
Published: 01 July 2015
Vadose Zone Journal (2015) 14 (7): vzj2014.09.0134.
...Jim E. Szecsody; Mike J. Truex; Lirong Zhong; James P. McKinley; Nikolla P. Qafoku; Brady D. Lee; Sabrina D. Saurey Abstract Technetium-99 is a mobile, long-lived radionuclide and environmental risk driver at some nuclear waste sites. The feasibility of decreasing 99 Tc mobility in vadose zone...
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Journal Article
Published: 01 October 2014
Mineralogical Magazine (2014) 78 (5): 1097–1113.
... © 2014 The Mineralogical Society 2014 Uranium technetium iron oxides wüstite portlandite radionuclide behaviour geological disposal I n the UK, significant amounts of nuclear waste generated from military, medical and civilian nuclear power sources have accumulated over a period...
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Journal Article
Published: 01 August 2014
Vadose Zone Journal (2014) 13 (8): vzj2014.04.0044.
... zone water extraction is being considered at the Hanford Site in Washington State as a means to remove technetium-99 contamination from low permeability sediments with relatively high water contents. A series of intermediate-scale laboratory experiments have been conducted to improve the fundamental...
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Journal Article
Published: 01 December 2012
Mineralogical Magazine (2012) 76 (8): 3435–3438.
...N. D. M. Evans; R. Hallam Abstract In the UK, technetium may be disposed of in a high pH, low Eh cementitious repository. In such a scenario, its chemistry would be dominated by TcO 4 − , in aerobic conditions and the sparingly soluble TcO 2(s) in anaerobic conditions. Repository heterogeneity...
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Journal Article
Published: 01 November 2012
Vadose Zone Journal (2012) 11 (4): vzj2011.0184.
.... Wood M.I. . 2012 . Diffusion of radionuclides in concrete and soil . In: Rahman R.A. , editor, Radioactive waste . InTech Publ. , Rijeka, Croatia . doi:10.5772/33311 Mattigod S.V. Whyatt G.A. Serne R.J. Wood M.I. . 2004 . Diffusion of iodine and technetium-99...
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Journal Article
Published: 01 November 2012
Vadose Zone Journal (2012) 11 (4): vzj2011.0144.
.... Aqueous waste discharges to disposal cribs approximately 50 yr ago distributed water and contaminants, primarily technetium-99 and nitrate, within the 100-m deep vadose zone at the test site. The test was conducted adjacent to one of the former disposal cribs in a contaminated portion of the vadose zone...
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Journal Article
Published: 01 November 2012
Vadose Zone Journal (2012) 11 (4): vzj2011.0142.
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Series: GSA Memoirs
Published: 01 October 2012
DOI: 10.1130/2012.1209(06)
.... Uranium-233, uranium-234, iodine-129, technetium-99, and other radionuclides also have been included in some experiments. Solubilities were determined experimentally in representative Yucca Mountain waters. Sorption coefficients were determined using water, rock, and pure mineral samples from Yucca...
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...
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Journal Article
Published: 01 February 2012
Vadose Zone Journal (2012) 11 (1): vzj2011.0089.
...M. Oostrom; T.W. Wietsma; C.E. Strickland; V.L. Freedman; M.J. Truex Abstract Soil desiccation, in conjunction with surface infiltration control, is considered at the Hanford Site as a potential technology to limit the flux of technetium and other contaminants in the vadose zone to the groundwater...
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Journal Article
Published: 01 August 2011
Mineralogical Magazine (2011) 75 (4): 2419–2430.
...J. M. McBeth; J. R. Lloyd; G. T. W. Law; F. R. Livens; I. T. Burke; K. Morris Abstract Iron minerals influence the environmental redox behaviour and mobility of metals including the long-lived radionuclide technetium. Technetium is highly mobile in its oxidized form pertechnetate (Tc(VII...
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Journal Article
Published: 01 August 2011
Mineralogical Magazine (2011) 75 (4): 2439–2448.
... in the circumneutral area. These data will inform the performance assessment for the near-field behaviour of technetium in the UK's planned higher-activity wastes GDF. Surface complexation modelling has been performed, fitting the data using both monodentate and bidentate binding models. * E-mail: n.d.m.evans...
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Journal Article
Published: 01 June 2011
Mineralogical Magazine (2011) 75 (3): 796–824.
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...
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Journal Article
Published: 01 November 2007
Vadose Zone Journal (2007) 6 (4): 946–958.
... high amounts of inorganic salts with significant amounts of radionuclides including uranium, plutonium, and fission products ( USDOE, 2003 ). Additionally, the BCCT site received the largest inventory of technetium-99 ( 99 Tc) ever disposed to the ground at Hanford, which equated to approximately 410...
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Journal Article
Published: 01 November 2007
Vadose Zone Journal (2007) 6 (4): 985–1003.
... of oxidation of the reduced valence states. Similar laboratory experiments to those of Qafoku et al. (2003) have been performed with the oxyanion 99 Tc(VII)O 4 − (Hess, personal communication, 2007), a major risk-driving contaminant at Hanford. Technetium-99 exhibits some similarities in redox...
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Journal Article
Published: 01 November 2007
Vadose Zone Journal (2007) 6 (4): 935–945.
... movement through the vadose zone to groundwater. The transport of representative mobile (technetium-99) and immobile (cesium-137) constituents was evaluated in modeling. The model considered the accelerated movement of moisture around and beneath single-shell tanks that is attributed to bare, gravel...
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Journal Article
Published: 01 November 2007
Vadose Zone Journal (2007) 6 (4): 899–905.
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