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Using Backscattering to Enhance Efficiency in Neutron Detectors
European Spallat Source ERIC, S-22363 Lund, Sweden..
European Spallat Source ERIC, S-22363 Lund, Sweden..
European Spallat Source ERIC, S-22363 Lund, Sweden.;Tech Univ Denmark, DTU Nutech, Riso Campus, DK-4000 Roskilde, Denmark..
European Spallat Source ERIC, S-22363 Lund, Sweden.;Tech Univ Denmark, DTU Nutech, Riso Campus, DK-4000 Roskilde, Denmark..
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2017 (English)In: IEEE Transactions on Nuclear Science, ISSN 0018-9499, E-ISSN 1558-1578, Vol. 64, no 6, 1562-1573 p.Article in journal (Refereed) Published
Abstract [en]

The principle of using strongly scattering materials to recover efficiency in detectors for neutron instruments, via backscattering of unconverted thermal neutrons, is discussed in general. The feasibility of the method is illustrated through Geant4-based simulations involving thermal neutrons impinging on a specific setup with a layer of polyethylene placed behind a single-layered boron-10 thin-film gaseous detector. The results show that detection efficiencies can be as much as doubled in the most ideal scenario, but with associated adverse contributions to spatial and timing resolutions of, respectively, centimeters and tens of microseconds. Potential mitigation techniques to contain the impact on resolution are investigated and are found to alleviate the issues to some degree, at a cost of reduced gain in efficiency.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2017. Vol. 64, no 6, 1562-1573 p.
Keyword [en]
Backscattering, boron-10, geant4, Monte Carlo simulations, neutron detectors, polyethylene (PE)
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-330746DOI: 10.1109/TNS.2017.2695404ISI: 000404974000008OAI: oai:DiVA.org:uu-330746DiVA: diva2:1147428
Funder
EU, Horizon 2020, 676548
Available from: 2017-10-05 Created: 2017-10-05 Last updated: 2017-10-05Bibliographically approved

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