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Colloid-Facilitated Transport of Radionuclides through the Vadose Zone

Description: The main purpose of this project was to advance the basic scientific understanding of colloid and colloid-facilitated Cs transport of radionuclides in the vadose zone. We focused our research on the hydrological and geochemical conditions beneath the leaking waste tanks at the USDOE Hanford reservation. Specific objectives were (1) to determine the lability and thermodynamic stability of colloidal materials, which form after reacting Hanford sediments with simulated Hanford Tank Waste, (2) to c… more
Date: November 21, 2006
Creator: Flury, Markus; Harsh, James B.; McCarthy, John F.; Lichtner, Peter C. & Zachara, John M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Clay-based geothermal drilling fluids

Description: The rheological properties of fluids based on fibrous clays such as sepiolite and attapulgite have been systematically examined under conditions similar to those of geothermal wells, i.e. at elevated temperatures and pressures in environments with concentrated brines. Attapulgite- and sepiolite-based fluids have been autoclaved at temperatures in the range from 70 to 800/sup 0/F with the addition of chlorides and hydroxides of Na, K, Ca, and Mg. The rheological properties (apparent and plastic … more
Date: November 1, 1982
Creator: Guven, N.; Carney, L.L.; Lee, L.J. & Bernhard, R.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geostatistical Analysis of Spatial Variability of Mineral Abundance and Kd in Frenchman Flat, NTS, Alluvium

Description: LLNL hydrologic source term modeling at the Cambric site (Pawloski et al., 2000) showed that retardation of radionuclide transport is sensitive to the distribution and amount of radionuclide sorbing minerals. While all mineralogic information available near the Cambric site was used in these early simulations (11 mineral abundance analyses from UE-5n and 9 from RNM-l), these older data sets were qualitative in nature, with detection limits too high to accurately measure many of the important ra… more
Date: November 1, 2002
Creator: Carle, S F; Zavarin, M & Pawloski, G A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The behavior of silicon and boron in the surface of corroded nuclear waste glasses : an EFTEM study.

Description: Using electron energy-loss filtered transmission electron microscopy (EFTEM), we have observed the formation of silicon-rich zones on the corroded surface of a West Valley (WV6) glass. This layer is approximately 100-200 nm thick and is directly underneath a precipitated smectite clay layer. Under conventional (C)TEM illumination, this layer is invisible; indeed, more commonly used analytical techniques, such as x-ray energy dispersive spectroscopy (EDS), have failed to describe fully the local… more
Date: November 23, 1999
Creator: Buck, E. C.; Smith, K. L. & Blackford, M. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sorption Behavior of Strontium-85 Onto Colloids of Silica and Smectite

Description: Strontium-90 is one of the sizable radioactive contaminants found in DP Canyon at Los Alamos, New Mexico. Radioactive surveys found the {sup 90}Sr is present in surface and groundwater in DP Canyon and Los Alamos Canyon. Colloids may influence the transport of this radionuclide in surface water and groundwater environments in both canyons. In this study, we investigated the sorption/desorption behavior of Sr on colloids of smectite and silica. Laboratory batch sorption experiments were conducte… more
Date: November 10, 1998
Creator: Lu, N.; Triay, I.R.; Mason, C.F.V. & Longmire, P.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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