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Hazardous Gas Production by Alpha Particles in Solid Organic Transuranic Waste Matrices

Description: Research Objective Fundamental radiation chemical techniques are used to elucidate the basic processes occurring in the heavy-ion radiolysis of some of the solid hydrocarbon matrices such as polymers that are associated with many of the transuranic waste deposits or the transportation of these radionuclides. The environmental management of mixed waste containing transuranic radionuclides is difficult because these nuclides are alpha particle emitters and the energy deposited by the alpha particles causes chemical transformations in the matrices accompanying the waste. Basic gamma radiolysis studies have been performed on some organic matrices, however, the chemical changes induced by alpha particles and other heavy ions are typically very different and product yields can vary by a large magnitude. The objective of this research is to measure the production of hazardous gases such as molecular hydrogen and methane produced in the proton, helium ion, and carbon ion radiolysis of selected solid organic matrices in order to obtain fundamental mechanistic information on the radiolytic decomposition of these materials. This knowledge can also be used to directly give reasonable estimates of explosive or flammability hazards in the storage or transport of transuranic wastes in order to enhance the safety of DOE sites.
Date: June 1, 1999
Creator: LaVerne, Jay A.
Partner: UNT Libraries Government Documents Department

Hazardous Gas Production by Alpha Particles in Solid Organic Transuranic Waste Matrices

Description: Fundamental radiation chemical techniques are used to elucidate the basic processes occurring in the heavy-ion radiolysis of some of the solid hydrocarbon matrices such as polymers that are associated with many of the transuranic waste deposits or the transportation of these radionuclides. The environmental management of mixed waste containing transuranic radionuclides is difficult because these nuclides are alpha particle emitters and the energy deposited by the alpha particles causes chemical transformations in the matrices accompanying the waste. Basic gamma radiolysis studies have been performed on some organic matrices, however, the chemical changes induced by alpha particles and other heavy ions are typically very different and product yields can vary by a large magnitude. The objective of this research is to measure the production of hazardous gases such as molecular hydrogen and methane produced in the proton, helium ion, and carbon ion radiolysis of selected solid organic matrices in order to obtain fundamental mechanistic information on the radiolytic decomposition of these materials. This knowledge can also be used to directly give reasonable estimates of explosive or flammability hazards in the storage or transport of transuranic wastes in order to enhance the safety of DOE sites.
Date: June 1, 1999
Creator: LaVerne, Jay A.
Partner: UNT Libraries Government Documents Department

Supercritical Carbon Dioxide-Soluble Ligands for Extracting Actinide Metal Ions from Porous Solids

Description: The focus of the effort during the project period from 9/16/98 to 6/15/99 has been on the synthesis, aggregation, and coordination chemistry of silyl-containing diphosphonic acids that potentially could be useful as solvent extraction reagents in supercritical CO2. A homologous series of alkylenediphosphonic acids was esterified with 3-(trimethylsilyl)-1- propanol to the symmetrically-substituted diesters. The silicon-containing alcohol 3- (trimethylsilyl)-1-propanol was chosen for esterification of the diphosphonic acids because it contains both a silyl group and a trimethylene linker. Separating the trimethylsilyl from the organo-functional group by three carbon atoms is optimal for achieving chemical stability and synthetic accessibility. The synthesis of these compounds utilizes methodology that relies on dicyclohexylcarbodiimide as the esterification reagent to activate the acid.
Date: June 1, 1999
Creator: Dietz, Mark L.; Barrans Jr., Richard E.; Herlinger, Albert & Brennecke, Joan F.
Partner: UNT Libraries Government Documents Department