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  • 1
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    Policy: Reassess New Mexico's nuclear-waste repository (2016)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2016-01-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tracy, Cameron L -- Dustin, Megan K -- Ewing, Rodney C -- England -- Nature. 2016 Jan 14;529(7585):149-51. doi: 10.1038/529149a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for International Security and Cooperation, Stanford University, California, USA. ; Department of Geological Sciences, Stanford University, California, USA. ; Frank Stanton professor in nuclear security at the Center for International Security and Cooperation, Stanford University, California, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26762442" target="_blank"〉PubMed〈/a〉
    Keywords: Humans ; New Mexico ; Plutonium/adverse effects ; *Policy Making ; Radioactive Hazard Release/prevention & control/statistics & numerical data ; *Radioactive Waste/adverse effects ; Risk Assessment ; *Safety/statistics & numerical data
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    Thermodynamic investigation of uranyl vanadate minerals: Implications for structural stability (2017)
    Mineralogical Society of America
    Details
    Publication Date: 2017-06-02
    Description: Understanding the crystal chemistry, materials properties, and thermodynamics of uranyl minerals and their synthetic analogs is an essential step for predicting and controlling the long-term environmental behavior of uranium. Uranyl vanadate minerals are relatively insoluble and widely disseminated within U ore deposits and mine and mill tailings. Pure uranyl vanadate mineral analogs were synthesized for investigation using high-temperature drop solution calorimetry. Calculated standard-state enthalpies of formation were found to be –4928.52 ± 13.90, –5748.81 ± 13.59, and –6402.88 ± 21.01, kJ/mol for carnotite, curienite, and francevillite, respectively. Enthalpies of formation from binary oxides for uranyl vanadate minerals exhibit a positive linear correlation as a function of the acidity of oxides. Normalized charge deficiency per anion (NCDA) is presented to relate bonding requirements of the structural units and interstitial complexes. An exponential correlation was observed between NCDA and energetic stability (enthalpy of formation from binary oxides) for the studied minerals. Additionally, NCDA and oxide acidity exhibit an exponential correlation where decreasing oxide acidity results in an exponential decrease in NCDA. The number of occurrences of uranyl vanadate mineral species are found to correlate with both enthalpy of formation from oxides and NCDA.
    Print ISSN: 0003-004X
    Electronic ISSN: 1945-3027
    Topics: Geosciences
    Published by Mineralogical Society of America
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