Thermodynamic Tables for Nuclear Waste Isolation, V.1: Aqueoussolutions Database

Phillips, S.L.; Hale, F.V.; Silvester, Leonard F.

doi:10.2172/929657

Cited by 18 publications

(13 citation statements)

References 5 publications

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“…The ∆H f 0 values were then estimated using the assumption that a linear dependence exists between ∆G f 0 and ∆H f 0 (Phillips et al 1988). Hence, approximate thermodynamic values were calculated for the phases for which no data were available {e.g., hollandite (BaAl 2 Ti 6 O 16 ) and Ti hydroxide [Ti(OH) 4 ]}.…”

Section: Microstructure and Phase Chemistry Of Starting Materialsmentioning

confidence: 99%

Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides

Leturcq

Advocat

Hart

et al. 2001

American Mineralogist

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Section: Microstructure and Phase Chemistry Of Starting Materialsmentioning

confidence: 99%

Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides

Leturcq

Advocat

Hart

et al. 2001

American Mineralogist

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“…Extensive databases of thermodynamic property values and kinetic rates are required for these codes and several such databases for the actinides have been developed over the last three decades. Of historical importance are the compilations and reviews of Lemire and Tremaine (1980), Phillips et al (1988), andFuger et al (1990). Comprehensive and consistent databases have been based on compilations produced by the NEA for plutonium and neptunium (Lemire et al, 2001), americium , uranium (Grenthe et al, 1992), and technetium (Rard et al, 1999).…”

Section: Radionuclide Geochemistry: Principles and Methodsmentioning

confidence: 99%

Radioactivity, Geochemistry, and Health

Siegel

Bryan

2014

Treatise on Geochemistry

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“…Several databases of thermodynamic properties of the actinides have been developed over the last three decades. Of historical importance are the compilations and reviews of Lemire and Tremaine (1980), Phillips et al (1988), andFuger et al (1990). The most recent comprehensive and consistent databases have been based on compilations produced by the Nuclear Energy Agency (NEA) for plutonium and neptunium (Lemire et al, 2001), americium , uranium (Grenthe et al, 1992) and technetium (Rard et al, 1999).…”

Section: Aqueous Speciation and Solubilitymentioning

confidence: 99%

Environmental Geochemistry of Radioactive Contamination

Siegel

Bryan

2003

Treatise on Geochemistry

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This report attempts to describe the geochemical foundations of the behavior of radionuclides in the environment. The information is obtained and applied in three interacting spheres of inquiry and analysis: 1) experimental studies and theoretical calculations, 2) field studies of contaminated and natural analog sites and 3) model predictions of radionuclide behavior in remediation and waste disposal. Analyses of the risks from radioactive contamination require estimation of the rates of release and dispersion of the radionuclides through potential exposure pathways. These processes are controlled by solubility, speciation, sorption, and colloidal transport, which are strong functions of the compositions of the groundwater and geomedia as well as the atomic structure of the radionuclides.The chemistry of the fission products is relatively simple compared to the actinides. Because of their relatively short half-lives, fission products account for a large fraction of the radioactivity in nuclear waste for the first several hundred years but do not represent a long-term hazard in the environment. The chemistry of the longer-lived actinides is complex; however, some trends in their behavior can be described. Actinide elements of a given oxidation state have either similar or systematically varying chemical properties due to similarities in ionic size, coordination number, valence, and electron structure. In dilute aqueous systems at neutral to basic pH, the dominant actinide species are hydroxy-and carbonato-complexes, and the solubility-limiting solid phases are commonly oxides, hydroxides or carbonates. In general, actinide sorption will decrease in the presence of ligands that complex with the radionuclide; sorption of the (IV) species of actinides (Np, Pu, U) is generally greater than of the (V) species.The geochemistry of key radionuclides in three different environments is described in this report. These include: 1) low ionic strength reducing waters from crystalline rocks at nuclear waste research 4 sites in Sweden; 2) oxic water from the J-13 well at Yucca Mountain, Nevada, the site of a proposed repository for high level nuclear waste (HLW) in tuffaceous rocks; and 3) reference brines associated with the Waste Isolation Pilot Plant (WIPP). The transport behaviors of radionuclides associated with the Chernobyl reactor accident and the Oklo Natural Reactor are described. These examples span wide temporal and spatial scales and include the rapid geochemical and physical processes important to nuclear reactor accidents or industrial discharges as well as the slower processes important to the geologic disposal of nuclear waste.Application of geochemical information to remediating or assessing the risk posed by radioactive contamination is the final subject of this report. After radioactive source terms have been removed, large volumes of soil and water with low but potentially hazardous levels of contamination may remain. For poorly-sorbing radionuclides, capture of contaminated water and removal of radi...

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Thermodynamic Tables for Nuclear Waste Isolation, V.1: Aqueoussolutions Database

Cited by 18 publications

References 5 publications

Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides

Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides

Radioactivity, Geochemistry, and Health

Environmental Geochemistry of Radioactive Contamination

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