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@ARTICLE{Schmidt:289482,
      author       = {S. Schmidt$^*$ and A. Stabilini and L. J. Thai$^*$ and E.
                      G. Yukihara and O. Jäkel$^*$ and J. A. Vedelago$^*$},
      title        = {{C}onverter thickness optimisation using {M}onte {C}arlo
                      simulations of {F}luorescent {N}uclear {T}rack {D}etectors
                      for neutron dosimetry},
      journal      = {Radiation measurements},
      volume       = {173},
      issn         = {1350-4487},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {DKFZ-2024-00804},
      pages        = {107097},
      year         = {2024},
      note         = {#EA:E040#LA:E040#},
      abstract     = {Secondary neutrons generated during ion beam radiotherapy
                      present a concern due to the potential dosedeposition beyond
                      the treatment volume, thereby elevating the risk of inducing
                      secondary tumours. Theseneutrons can possess energies
                      comparable to those of the primary ions, reaching magnitudes
                      of severalhundred MeV, posing a challenge for neutron
                      detectors. Fluorescent Nuclear Track Detectors (FNTDs)
                      arepromising detectors for high-energy neutron dosimetry
                      given their capability to detect particles with a lowlinear
                      energy transfer. In this work, the sensitivity of FNTDs to
                      neutron energies reaching 20 MeV was analysedby experiments
                      and Monte Carlo (MC) simulations, quantifying the recoil
                      proton yield of FNTDs combinedwith polyethylene (PE)
                      converters of different thicknesses. The FNTDs were read out
                      using a dedicated FNTDreader, demonstrating a reasonable
                      uncertainty by analysing a detector area of 0.1 mm2.
                      Investigations ofdifferent converter thicknesses reveal
                      optimal detector sensitivity between 0.5 mm to 1.0 mm for a
                      241AmBesource, yielding a maximum sensitivity of (22.7±3.4)
                      tracks mSv−1 mm−2. Similar converter-FNTD
                      configurationswere assessed through MC simulations using
                      FLUKA, yielding a correlation between detector sensitivity
                      andconverter thickness. Furthermore, an enhanced detector
                      sensitivity for neutron energies up to 20 MeV wasfound for
                      the PE converter thickness of 4.0 mm. The MC simulations can
                      be used to optimise FNTD detectorconfigurations for
                      measuring higher neutron energies by maximising the recoil
                      proton yield.},
      cin          = {E040},
      ddc          = {530},
      cid          = {I:(DE-He78)E040-20160331},
      pnm          = {315 - Bildgebung und Radioonkologie (POF4-315)},
      pid          = {G:(DE-HGF)POF4-315},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.radmeas.2024.107097},
      url          = {https://inrepo02.dkfz.de/record/289482},
}