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Measurement of the thickness of B4C layers deposited over metallic grids via multi-angle neutron radiography
Univ Milano Bicocca, Milan, Italy.
STFC Rutherford Appleton Lab, Berks, England.
IENI CNR, Milan, Italy.
Univ Milano Bicocca, Milan, Italy.
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2019 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 30, no 1, article id 015402Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2019. Vol. 30, no 1, article id 015402
Keywords [en]
neutron radiography, non-destructive analysis, thickness measurement
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-35405DOI: 10.1088/1361-6501/aaf409ISI: 000453373700001Scopus ID: 2-s2.0-85063965616OAI: oai:DiVA.org:miun-35405DiVA, id: diva2:1276595
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-05-24Bibliographically approved

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Hall-Wilton, Richard

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