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@INPROCEEDINGS{Schumann:172930,
      author       = {Schumann, Manuel and Engels, Ralf and Frank, Martin and
                      Furletova, Julia and Furletov, Sergey and Havenith, Andreas
                      and Kemmerling, Günter and Kettler, John and
                      Klapdor-Kleingrothaus, Thorwald and Mauerhofer, Eric and
                      Schitthelm, Oliver and Vasques, Richard and Voß, Dirk},
      title        = {{F}ast {N}eutron {I}maging with an a{S}i {D}etector for
                      {N}uclear {W}aste {A}ssay},
      reportid     = {FZJ-2014-06360},
      year         = {2015},
      abstract     = {Introduction: Radioactive waste has to undergo a process of
                      quality checking in order to check its conformance with
                      national regulations prior to its transport, intermediate
                      storage and final disposal. Within the quality checking of
                      radioactive waste packages non-destructive assays are
                      required to characterize their radiotoxic and chemotoxic
                      contents. In a cooperation framework Forschungszentrum
                      Jülich GmbH, RWTH Aachen University and Siemens AG are
                      studying the feasibility of a compact Neutron Imaging System
                      for Radioactive waste Analysis (NISRA) using 14 MeV
                      neutrons. Fast neutron imaging is a promising technique to
                      assay large and dense items providing in complementarity to
                      photon imaging additional information on the presence of
                      structures in radioactive waste packages. However due to the
                      low neutron emission of neutron generators the challenging
                      task resides in the development of an imaging detector with
                      a high efficiency, a low sensitivity to gamma radiation and
                      a resolution sufficient for the purpose.Setup: The setup of
                      the experiment is shown in Figure 1. The 14 MeV neutrons are
                      produced by a D-T neutron generator. Neutron detection is
                      achieved using a 40 x 40 cm² amorphous silicon (aSi) flat
                      panel detector linked to a plastic scintillator. The
                      detector thermal noise was reduced by employing an entrance
                      windows made of aluminium. The optimal gain and integration
                      time were obtained by measuring the response of the detector
                      to the radiation of a 241Am source.Performance Tests: First
                      test measurements were carried out with different materials
                      made of Al, C, Fe, Pb, W, concrete and polyethylene (50 x 80
                      x 100 mm³). Each sample was irradiated with PE as a
                      reference. Data analysis was performed with a homemade
                      algorithm which allows determining a value related to the
                      neutron absorption.Results: First neutron radiographies were
                      successfully recorded despite the low detector efficiency
                      and low neutron intensity. In addition the correlation
                      between the absorption and measured signal attenuation was
                      determined and is shown in figure 2. The measurements and
                      results will be presented and discussed.},
      month         = {Feb},
      date          = {2015-02-23},
      organization  = {25th Seminar on Activation Analysis
                       and Gamma Spectroscopy, Aachen
                       (Deutschland), 23 Feb 2015 - 25 Feb
                       2015},
      cin          = {IEK-6},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {161 - Nuclear Waste Management (POF3-161) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-161 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)1},
      url          = {https://juser.fz-juelich.de/record/172930},
}