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Neutron imaging with Li-glass based multicore SCIntillating FIber (SCIFI)

Neutron imaging with Li-glass based multicore SCIntillating FIber (SCIFI)
Neutron imaging with Li-glass based multicore SCIntillating FIber (SCIFI)
The improvement of neutron imaging towards and beyond the microscale is a well-documented need for the iterative characterization and modeling of numerous microstructured X-ray opaque materials. This work presents the recent progress in evaluating a SCIntillating FIber (SCIFI) proof-of-concept towards micron-level thermal neutron radiography. These SCIFIs are composed of 6Li-enriched silicate glass cores doped with a Ce activator. The cores possess ~8.5 µm diameters and ~10 µm pitch following fiber drawing with a cladding glass into an all-solid multicore fiber. A polished 5 mm × 5 mm array of 100 microstructured multicore SCIFI pixels was fabricated into a 1 mm thick faceplate. The neutron efficiency and light yield of the faceplate are characterized as functions of the 7.38 weight percent of Li2O, thickness, and the 70% active volume. It was determined that approximately 39% of a thermal neutron (2 Å) beam can be absorbed by the faceplate. The 6Li(n,α)t reaction is estimated to produce 7,700 ± 1,000 scintillation photons per event, referencing light collection from 241 Am irradiation of the faceplate. Simulations suggest that on average 17.5 ± 1.4% of these photons will be transported to an end of the fiber array for a thermal beam, with at least 7.2% of that total scintillation light being confined into the fiber cores in which it originated. The SCIFI faceplate was integrated into the Neutron Microscope (NM) at the Pulse OverLap DIffractometer (POLDI) beamline located at the Paul Scherrer Institut to image a Siemens star test object. Processed neutron radiographs acquired with the proof-of-concept faceplate resolved features at a state-of-the-art resolution of 16.1 ± 0.5 µm. The potential for even high resolution designs having smaller pitch or different cladding material is discussed.
0733-8724
5699-5706
Moore, Michael E.
1e9b0eec-febc-4ab3-bea9-09cd14b6dbb8
Trtik, Pavel
4383be9d-8244-4f44-9128-29fdd08da258
Lousteau, Joris
0758be5e-04e3-452f-81f9-7616cf4a3de3
Pugliese, Diego
b08afd00-ac28-4c6b-a0cd-4a14ecb537f2
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Hayward, Jason P.
fc3fcdb4-0a04-472a-823e-e629b564612d
Moore, Michael E.
1e9b0eec-febc-4ab3-bea9-09cd14b6dbb8
Trtik, Pavel
4383be9d-8244-4f44-9128-29fdd08da258
Lousteau, Joris
0758be5e-04e3-452f-81f9-7616cf4a3de3
Pugliese, Diego
b08afd00-ac28-4c6b-a0cd-4a14ecb537f2
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Hayward, Jason P.
fc3fcdb4-0a04-472a-823e-e629b564612d

Moore, Michael E., Trtik, Pavel, Lousteau, Joris, Pugliese, Diego, Brambilla, Gilberto and Hayward, Jason P. (2019) Neutron imaging with Li-glass based multicore SCIntillating FIber (SCIFI). Journal of Lightwave Technology, 37 (22), 5699-5706. (doi:10.1109/JLT.2019.2934497).

Record type: Article

Abstract

The improvement of neutron imaging towards and beyond the microscale is a well-documented need for the iterative characterization and modeling of numerous microstructured X-ray opaque materials. This work presents the recent progress in evaluating a SCIntillating FIber (SCIFI) proof-of-concept towards micron-level thermal neutron radiography. These SCIFIs are composed of 6Li-enriched silicate glass cores doped with a Ce activator. The cores possess ~8.5 µm diameters and ~10 µm pitch following fiber drawing with a cladding glass into an all-solid multicore fiber. A polished 5 mm × 5 mm array of 100 microstructured multicore SCIFI pixels was fabricated into a 1 mm thick faceplate. The neutron efficiency and light yield of the faceplate are characterized as functions of the 7.38 weight percent of Li2O, thickness, and the 70% active volume. It was determined that approximately 39% of a thermal neutron (2 Å) beam can be absorbed by the faceplate. The 6Li(n,α)t reaction is estimated to produce 7,700 ± 1,000 scintillation photons per event, referencing light collection from 241 Am irradiation of the faceplate. Simulations suggest that on average 17.5 ± 1.4% of these photons will be transported to an end of the fiber array for a thermal beam, with at least 7.2% of that total scintillation light being confined into the fiber cores in which it originated. The SCIFI faceplate was integrated into the Neutron Microscope (NM) at the Pulse OverLap DIffractometer (POLDI) beamline located at the Paul Scherrer Institut to image a Siemens star test object. Processed neutron radiographs acquired with the proof-of-concept faceplate resolved features at a state-of-the-art resolution of 16.1 ± 0.5 µm. The potential for even high resolution designs having smaller pitch or different cladding material is discussed.

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More information

Accepted/In Press date: 7 August 2019
e-pub ahead of print date: 12 August 2019
Published date: 15 November 2019

Identifiers

Local EPrints ID: 441919
URI: http://eprints.soton.ac.uk/id/eprint/441919
ISSN: 0733-8724
PURE UUID: e558ead8-8463-4d7e-b9bc-67a85bd3dae1
ORCID for Gilberto Brambilla: ORCID iD orcid.org/0000-0002-5730-0499

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Date deposited: 02 Jul 2020 16:31
Last modified: 02 Apr 2022 01:38

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Contributors

Author: Michael E. Moore
Author: Pavel Trtik
Author: Joris Lousteau
Author: Diego Pugliese
Author: Jason P. Hayward

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