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B4C thin films for neutron detection


  • Carina Höglund
  • Jens Birch
  • Ken Andersen
  • Thierry Bigault
  • Jean-Claude Buffet
  • Jonathan Correa
  • Patrick van Esch
  • Bruno Guerard
  • Richard Hall-Wilton
  • Jens Jensen
  • Anton Khaplanov
  • Francesco Piscitelli
  • Christian Vettier
  • Wilhelmus Vollenberg
  • Lars Hultman

Summary, in English

Due to the very limited availability of He-3, new kinds of neutron detectors, not based on 3He, are urgently needed. Here, we present a method to produce thin films of (B4C)-B-10, with maximized detection efficiency, intended to be part of a new generation of large area neutron detectors. B4C thin Films have been deposited onto Al-blade and Si wafer substrates by dc magnetron sputtering from (B4C)-B-nat and (B4C)-B-10 targets in an Ar discharge, using an industrial deposition system. The films were characterized with scanning electron microscopy, elastic recoil detection analysis, x-ray reflectivity, and neutron radiography. We show that the film-substrate adhesion and film purity are improved by increased substrate temperature and deposition rate. A deposition rate of 3.8 angstrom/s and substrate temperature of 400 degrees C result in films with a density close to bulk values and good adhesion to film thickness above 3 mu m. Boron-10 contents of almost 80 at. % are obtained in 6.3 m(2) of 1 mu m thick (B4C)-B-10 thin films coated on Al-blades. Initial neutron absorption measurements agree with Monte Carlo simulations and show that the layer thickness, number of layers, neutron wavelength, and amount of impurities are determining factors. The study also shows the importance of having uniform layer thicknesses over large areas, which for a full-scale detector could be in total similar to 1000 m(2) of two-side coated Al-blades with similar to 1 mu m thick (B4C)-B-10 films. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4718573]






Applied Physics Reviews






Artikel i tidskrift


American Institute of Physics (AIP)


  • Physical Sciences
  • Natural Sciences




  • ISSN: 1931-9401