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@ARTICLE{Kegler:890779,
      author       = {Kegler, Philip and Pointurier, Fabien and Rothe, Jörg and
                      Dardenne, Kathy and Vitova, Tonya and Beck, Aaron and
                      Hammerich, Simon and Potts, Shannon and Faure, Anne-Laure
                      and Klinkenberg, Martina and Kreft, Fabian and Niemeyer,
                      Irmgard and Bosbach, Dirk and Neumeier, Stefan},
      title        = {{C}hemical and structural investigations on uranium
                      oxide-based microparticles as reference materials for
                      analytical measurements},
      journal      = {MRS advances},
      volume       = {6},
      issn         = {2059-8521},
      address      = {Cambridge},
      publisher    = {Cambridge University Press},
      reportid     = {FZJ-2021-01195},
      pages        = {125-130},
      year         = {2021},
      abstract     = {The analysis of individual micrometre- and
                      submicrometre-sized particles collected by IAEA’s
                      safeguards inspectors on swipe samples during in-field
                      verification activities requires the implementation of a
                      sustainable quality control system such as suitable
                      microparticulate reference materials. To this end, pure and
                      neodymium-doped uranium oxide-based microparticles utilising
                      an aerosol-based particle production process were prepared.
                      SEM/EDX measurements confirmed the monodispersity of the
                      produced microspheres as well as the incorporation of 15
                      $mol\%$ Nd into the compound particles. The timeline of
                      structural investigations mirror the ongoing alteration of
                      particles being stored under laboratory atmosphere. While
                      results from in-SEM Raman (CEA, DAM) on microparticles after
                      two years storage time point to the formation of U3O8 and a
                      minor fraction of schoepite phase (hydrated UO3), in U
                      L3-edge XAFS after four months storage time and U M4-edge
                      HR-XANES after ten months storage time spectra (INE-Beamline
                      and ACT station @ KIT synchrotron radiation source) mainly
                      U(IV) and U(V), respectively, was observed. These results
                      provide new insight into ageing mechanism of the
                      microparticles after preparation. From these results
                      important conclusions with respect to storage conditions and
                      shelf life of the reference particles can be drawn. The
                      first batch of pure U-oxide microparticles produced in
                      Juelich was successfully certified regarding the isotopic
                      composition and the U amount per particle and applied in an
                      international laboratory exercise NUSIMEP-9.},
      cin          = {IEK-6},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {161 - Nuclear Waste Management (POF3-161) / 1411 - Nuclear
                      Waste Disposal (POF4-141) / IAEA GER SP - Joint Programme on
                      the Technical Development and Further Improvement of IAEA
                      Safeguards between the Government of the Federal Republic of
                      Germany and the International Atomic Energy Agency
                      (IAEA-19781005)},
      pid          = {G:(DE-HGF)POF3-161 / G:(DE-HGF)POF4-1411 /
                      G:(DE-Juel1)IAEA-19781005},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000619706300001},
      doi          = {10.1557/s43580-021-00024-1},
      url          = {https://juser.fz-juelich.de/record/890779},
}