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Neutron reflectometry on highly absorbing films and its application to (B4C)-B-10-based neutron detectors
European Spallat Source ERIC, Sweden; ILL Grenoble, France; University of Perugia, Italy.
European Spallat Source ERIC, Sweden; ILL Grenoble, France.
Ruhr University of Bochum, Germany.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC, 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, 20150711- p.Article in journal (Refereed) PublishedText
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
ROYAL SOC , 2016. Vol. 472, no 2185, 20150711- p.
Keyword [en]
neutron-induced fluorescence; neutron reflectometry; boron-10; neutron detection
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-125159DOI: 10.1098/rspa.2015.0711ISI: 000368479000021OAI: diva2:903406

Funding Agencies|BrightnESS project [INFRADEV-3-2015, 676548]; CRISP project (European Commission) [283745]; Swedish Research Council VR [2009-6232]; Carl Tryggers Foundation for Scientific Research; Knut and Alice Wallenberg Foundation

Available from: 2016-02-15 Created: 2016-02-15 Last updated: 2016-03-08

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Schmidt, SusannHöglund, CarinaBirch, Jens
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Thin Film PhysicsFaculty of Science & EngineeringDepartment of Physics, Chemistry and Biology
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