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Sökning: WFRF:(Gorini G) > Linköpings universitet

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1.
  • Vitucci, G., et al. (författare)
  • Measurement of the thickness of B4C layers deposited over metallic grids via multi-angle neutron radiography
  • 2019
  • Ingår i: Measurement science and technology. - : IOP Publishing. - 0957-0233 .- 1361-6501. ; 30:1
  • Tidskriftsartikel (refereegranskat)abstract
    • At the present time, different kinds of thermal neutron detectors are under development at the European Spallation Source research facility, in order to overcome the well-known problem of the He-3 shortage. One of these new systems relies on the use of a 3D neutron convener cathode that consists of a stack of aluminum grids, covered by a 0.9 mu m B-10 enriched boron carbide layer ((B4C)-B-10). As the conversion efficiency is a function of the boron thickness and the mean free path of the charged particles produced in the neutron induced reaction, the characterization of the boron carbide layer uniformity over the grids becomes crucial. In this work, a non-destructive method to map the thickness distribution of the converter layer over the grids is shown. The measurements exploit the white-beam neutron radiography technique where the specimen is irradiated at different angles. This experiment has been performed at the IMAT beamline operating at the ISIS spallation neutron source (UK). The results confirm that this non-destructive, wide-ranging technique allows a reliable and fast sample characterization and that it may be exploited in similar analyses where equivalent requirements are requested.
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2.
  • Muraro, A., et al. (författare)
  • MBGEM : a stack of borated GEM detector for high efficiency thermal neutron detection
  • 2021
  • Ingår i: The European Physical Journal Plus. - : SPRINGER HEIDELBERG. - 2190-5444. ; 136:7
  • Tidskriftsartikel (refereegranskat)abstract
    • A new position-sensitive thermal neutron detector based on boron-coated converters has been developed as an alternative to todays standard -based technology for application to thermal neutron scattering. The key elements of the development are the boron-coated GEM foils (Sauli in Nucl Instrum Methods Phys Res Sect A Accel Spectrom Detect Assoc Equip 386:531, 1997) that are used as a multi-layer neutron converter via the reaction together with an efficient collection of the produced secondary electrons. This paper reports the test performed on a 3 layers converter prototype coupled to a GEMPix detector (Murtas in Radiat Meas 138:106421, 2020), carried out in order to study the possibility to produce a large-scale multi-layer neutron detector capable to reach high detection efficiency with high spatial resolution and able to sustain the high neutron flux expected in the new neutron spallation source under development like the ESS.
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  • Resultat 1-2 av 2

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