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@INPROCEEDINGS{Altmaier:864726,
      author       = {Altmaier, Marcus and Bischofer, Barbara and Bosbach, Dirk
                      and Brendler, Vinzenz and Daniels, Natalia and Geckeis,
                      Horst and Hagemann, Sven and Müller, Katharina},
      title        = {{VESPA} {II} {P}roject: {B}ehavior of {L}ong-{L}ived
                      {F}ission and {A}ctivation {P}roducts in the {N}ear-{F}ield
                      of a {R}epository for {N}uclear {W}aste and {P}ossibilities
                      of their {R}etention},
      reportid     = {FZJ-2019-04397},
      year         = {2019},
      abstract     = {The German project VESPA II (www.vespa2.grs.de) aims at
                      studying the chemical properties of fission(FPs) and
                      activation products (APs), 137Cs, 129I, 99Tc, and 79Se, as
                      well as their transport behavior under conditions of
                      near-field of a nuclear waste repository. This knowledge is
                      mandatory for a safe and reliable long-term assessment of
                      high-level radioactive waste disposal avoiding conservative
                      assumptions. The work performed within VESPA II provides for
                      the necessary links between important aspects of the
                      management of FPs and APs in deep geological repositories.
                      In particular, we investigate: (1) the source term,
                      evaluating e.g. 129I inventory together with the instant
                      release fraction and its speciation; (2) the effect of
                      geochemical conditions in the near-field, i.e. T, p, Eh and
                      pH, on the processes of surface redox-mediation and
                      secondary mineral phases formation; (3) the solution
                      chemistry, determining stable solubility products, complex
                      formation and activity coefficients of Tc(IV) in presence of
                      anions, Tc(VII) in presence of cations, Se(-II) under acidic
                      conditions and Se(IV), Se(0), Cs(I), I(-I) at elevated
                      temperature; and (4) the retention behavior of I, Se and Tc
                      on layered double hydroxides (LDH), Fe-corrosion phases and
                      on calcite. Finally, safety analysis calculations will link
                      obtained results and provide for an improved confidence in
                      the risk assessment predictions.},
      month         = {Aug},
      date          = {2019-08-18},
      organization  = {Goldschmidt 2019, Barcelona (Spain),
                       18 Aug 2019 - 23 Aug 2019},
      subtyp        = {Other},
      cin          = {IEK-6},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {161 - Nuclear Waste Management (POF3-161)},
      pid          = {G:(DE-HGF)POF3-161},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/864726},
}