Rights statement: This is the author’s version of a work that was accepted for publication in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 834, 2016 DOI: 10.1016/j.nima.2016.07.044
Accepted author manuscript, 1.5 MB, PDF document
Available under license: CC BY: Creative Commons Attribution 4.0 International License
Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Fast neutron tomography with real-time pulse-shape discrimination in organic scintillation detectors
AU - Joyce, Malcolm John
AU - Agar, Stewart
AU - Aspinall, Michael
AU - Beaumont, Jonathan
AU - Colley, Edmund
AU - Colling, Miriam
AU - Dykes, Joseph Anttony
AU - Kardasopoulos, Phoevos
AU - Mitton, Katie
N1 - This is the author’s version of a work that was accepted for publication in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 834, 2016 DOI: 10.1016/j.nima.2016.07.044
PY - 2016/10/21
Y1 - 2016/10/21
N2 - A fast neutron tomography system based on the use of real-time pulse-shape discrimination in 7 organic liquid scintillation detectors is described. The system has been tested with a californium-252 source of dose rate 163 μSv/hr at 1 m and neutron emission rate of 1.5×107 per second into 4π and a maximum acquisition time of 2 hours, to characterize two 100 × 100 × 100 mm concrete samples. The first of these was a solid sample and the second has a vertical, cylindrical void. The experimental data, supported by simulations with both Monte Carlo methods and MATLAB ®, indicate that the presence of the internal cylindrical void, corners and inhomogeneities in the samples can be discerned. The potential for fast neutron assay of this type with the capability to probe hydrogenous features in large low-Z samples is discussed. Neutron tomography of bulk porous samples is achieved that combines effective penetration not possible with thermal neutrons in the absence of beam hardening.
AB - A fast neutron tomography system based on the use of real-time pulse-shape discrimination in 7 organic liquid scintillation detectors is described. The system has been tested with a californium-252 source of dose rate 163 μSv/hr at 1 m and neutron emission rate of 1.5×107 per second into 4π and a maximum acquisition time of 2 hours, to characterize two 100 × 100 × 100 mm concrete samples. The first of these was a solid sample and the second has a vertical, cylindrical void. The experimental data, supported by simulations with both Monte Carlo methods and MATLAB ®, indicate that the presence of the internal cylindrical void, corners and inhomogeneities in the samples can be discerned. The potential for fast neutron assay of this type with the capability to probe hydrogenous features in large low-Z samples is discussed. Neutron tomography of bulk porous samples is achieved that combines effective penetration not possible with thermal neutrons in the absence of beam hardening.
KW - Tomography
KW - Fast neutrons
KW - Image reconstruction
KW - Scintillation detectors
KW - Voids
U2 - 10.1016/j.nima.2016.07.044
DO - 10.1016/j.nima.2016.07.044
M3 - Journal article
VL - 834
SP - 36
EP - 45
JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
ER -