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Neutron reflectometry on highly absorbing films and its application to (B4C)-B-10-based neutron detectors
European Spallat Source ERIC, POB 176, S-22100 Lund, Sweden.;ILL Grenoble, 71 Ave Martyrs, F-38042 Grenoble, France.;Univ Perugia, Dept Phys, Piazza Univ 1, I-06123 Perugia, Italy..
European Spallat Source ERIC, POB 176, S-22100 Lund, Sweden.;ILL Grenoble, 71 Ave Martyrs, F-38042 Grenoble, France..
Ruhr Univ Bochum, D-44780 Bochum, Germany..
European Spallat Source ERIC, POB 176, S-22100 Lund, Sweden.;Linkoping Univ, Thin Film Phys Div, S-58183 Linkoping, Sweden..
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2016 (English)In: Proceedings of the Royal Society. Mathematical, Physical and Engineering Sciences, ISSN 1364-5021, E-ISSN 1471-2946, Vol. 472, no 2185, 20150711Article in journal (Refereed) Published
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Abstract [en]

Neutron reflectometry is a powerful tool used for studies of surfaces and interfaces. The absorption in the typical studied materials is neglected and this technique is limited only to the reflectivity measurement. For strongly absorbing nuclei, the absorption can be directly measured by using the neutron-induced fluorescence technique which exploits the prompt particle emission of absorbing isotopes. This technique is emerging from soft matter and biology where highly absorbing nuclei, in very small quantities, are used as a label for buried layers. Nowadays, the importance of absorbing layers is rapidly increasing, partially because of their application in neutron detection; a field that has become more active also due to the He-3-shortage. We extend the neutron-induced fluorescence technique to the study of layers of highly absorbing materials, in particular (B4C)-B-10. The theory of neutron reflectometry is a commonly studied topic; however, when a strong absorption is present the subtle relationship between the reflection and the absorption of neutrons is not widely known. The theory for a general stack of absorbing layers has been developed and compared to measurements. We also report on the requirements that a (B4C)-B-10 layer must fulfil in order to be employed as a converter in neutron detection.

Place, publisher, year, edition, pages
2016. Vol. 472, no 2185, 20150711
Keyword [en]
neutron-induced fluorescence, neutron reflectometry, boron-10, neutron detection
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-277803DOI: 10.1098/rspa.2015.0711ISI: 000368479000021OAI: oai:DiVA.org:uu-277803DiVA: diva2:905716
Funder
Swedish Research Council, 2009-6232Carl Tryggers foundation Knut and Alice Wallenberg Foundation
Available from: 2016-02-23 Created: 2016-02-23 Last updated: 2017-11-30Bibliographically approved

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