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 3 He shortage. One of these new systems relies on the use of a 3D neutron converter cathode that consists of a stack of aluminum grids, covered by a 0.9 µm 10 B enriched boron carbide layer ( 10 B 4 C). 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.

Vitucci, G., Minniti, T., Angella, G., Croci, G., Muraro, A., Höglund, C., et al. (2019). Measurement of the thickness of B4C layers deposited over metallic grids via multi-angle neutron radiography. MEASUREMENT SCIENCE & TECHNOLOGY, 30(1) [10.1088/1361-6501/aaf409].

Measurement of the thickness of B4C layers deposited over metallic grids via multi-angle neutron radiography

Vitucci, Giuseppe;ANGELLA, GIULIANO;Croci, Gabriele;Muraro, Andrea;Perelli Cippo, Enrico;Albani, Giorgia;Tardocchi, Marco;Gorini, Giuseppe
2019

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 3 He shortage. One of these new systems relies on the use of a 3D neutron converter cathode that consists of a stack of aluminum grids, covered by a 0.9 µm 10 B enriched boron carbide layer ( 10 B 4 C). 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.
Articolo in rivista - Articolo scientifico
Neutron radiography; non-destructive analysis; thickness measurement;
neutron radiography, thickness measurement, B4C
English
14-dic-2018
2019
30
1
015402
none
Vitucci, G., Minniti, T., Angella, G., Croci, G., Muraro, A., Höglund, C., et al. (2019). Measurement of the thickness of B4C layers deposited over metallic grids via multi-angle neutron radiography. MEASUREMENT SCIENCE & TECHNOLOGY, 30(1) [10.1088/1361-6501/aaf409].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/211723
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