Jörg Neuhausen, Laboratory for Radio- and Environmental Chemistry, Paul Scherrer Institute 27.-28.10.05 EURISOL DS Task 2 Meeting October 27-28, 2005 Saclay.

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Presentation transcript:

Jörg Neuhausen, Laboratory for Radio- and Environmental Chemistry, Paul Scherrer Institute EURISOL DS Task 2 Meeting October 27-28, 2005 Saclay J. Neuhausen (PSI) Innovative Waste Management

Jörg Neuhausen, Laboratory for Radio- and Environmental Chemistry, Paul Scherrer Institute Innovative Waste Management 2 Goals: 1. Reduction of radiotoxic components by chemical separation Problem: Hg-isotopes cannot be chemically separated 2.Extraction of radionuclides for diagnostic/therapy purposes

Jörg Neuhausen, Laboratory for Radio- and Environmental Chemistry, Paul Scherrer Institute Schematic program Decision, which Isotopes to extract Evaluation of thermochemical data Literature Data Theoretical Predictions Precipitation/filtrationOxidation/filtrationdistillation Test experiments (laboratory scale) adsorption Proposal on procedure, materials, operating conditions

Jörg Neuhausen, Laboratory for Radio- and Environmental Chemistry, Paul Scherrer Institute Work plan for first 12 months Definition on isotopes to extract: Interesting nuclides listed in Appendix C of EURISOL feasibility study: several Lanthanides, Ir, W, Sn, Sr, Ge, Cu, Ti, Si, Al, Mg Radiologic most relevant: Iodine, 148-Gd, 172-Hf, 194-Au (R. Moormann) Literature research on the chemical behaviour of these isotopes in Hg: Compilation of solubility data from literature established Theoretical thermochemical evaluations using the MIEDEMA model: Heats of solution of metals in mercury have been calculated A first comparison of solubility data and thermochemical data show no good agreement: Refinement of thermochemical model??

Jörg Neuhausen, Laboratory for Radio- and Environmental Chemistry, Paul Scherrer Institute Selection of extraction methods to be studied experimentally Electropositive metals (Lanthanides, Mg, Sr, W, Ti): Oxidation/filtration or adsorption on oxide surfaces Noble metals: Adsorption on metal surfaces (calculation of metal-metal interaction will be performed to evaluate suitable metals, Miedema-Model) P-Elements (e.g. Sn) Adsorption on basic oxides (metals?)