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Gamma-ray modulation properties of tungsten coded apertures for a novel mixed-field imaging system

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Gamma-ray modulation properties of tungsten coded apertures for a novel mixed-field imaging system. / Cieslak, Michal; Akurugoda Gamage, Kelum; Glover, Robert; Taylor, Charles James.

In: Journal of Instrumentation, Vol. 14, P02007, 08.02.2019.

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Cieslak, Michal ; Akurugoda Gamage, Kelum ; Glover, Robert ; Taylor, Charles James. / Gamma-ray modulation properties of tungsten coded apertures for a novel mixed-field imaging system. In: Journal of Instrumentation. 2019 ; Vol. 14.

Bibtex

@article{ad6b8540866f40138c726aa499e5136d,
title = "Gamma-ray modulation properties of tungsten coded apertures for a novel mixed-field imaging system",
abstract = "An investigation into the gamma-ray modulation properties of a tungsten coded aperture, whose design is based on the mathematical principles of Modified Uniformly Redundant Arrays (MURA), has been performed. Due to the small size of the individual cells, the aperture was built using additive manufacturing methods. The gamma-ray field was produced by a 137-Cs radioactive isotope at Lancaster University, UK. An organic plastic scintillator sample, which is capable of pulse shape discrimination, has been used to detect the gamma-ray field modulated by a tungsten aperture. Prior to the investigation of the aperture modulation properties, energy calibration of the scintillator was performed. Its pulse shape discrimination capabilities were verified using a 252-Cf fission source. In this study, each of 169 coded aperture cells were investigated by collimating the modulated gamma-ray field of 137-Cs through a 25.4 mm thick lead supporting plate. The supporting plate has one opening in the centre, of the same dimensions as the single aperture cell, i.e. 2.5 mm by 2.5 mm. The number of pulses detected for every aperture location were recorded in an array. The array was subsequently used to create a two-dimensional image of the source, which was encoded through the coded aperture pattern. Finally, the image was decoded using deconvolution techniques to reveal the actual source location. The new results obtained in this study indicate that sufficient gamma-ray modulation properties of the aperture can be determined, despite the relatively small footprint and thickness of the coded aperture.",
keywords = "scintillators, gamma detectors, neutron detectors, image processing, scintillation, light emission processes",
author = "Michal Cieslak and {Akurugoda Gamage}, Kelum and Robert Glover and Taylor, {Charles James}",
note = "This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Instrumentation. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/1748-0221/14/02/P02007",
year = "2019",
month = feb
day = "8",
doi = "10.1088/1748-0221/14/02/P02007",
language = "English",
volume = "14",
journal = "Journal of Instrumentation",
issn = "1748-0221",
publisher = "Institute of Physics Publishing",

}

RIS

TY - JOUR

T1 - Gamma-ray modulation properties of tungsten coded apertures for a novel mixed-field imaging system

AU - Cieslak, Michal

AU - Akurugoda Gamage, Kelum

AU - Glover, Robert

AU - Taylor, Charles James

N1 - This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Instrumentation. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/1748-0221/14/02/P02007

PY - 2019/2/8

Y1 - 2019/2/8

N2 - An investigation into the gamma-ray modulation properties of a tungsten coded aperture, whose design is based on the mathematical principles of Modified Uniformly Redundant Arrays (MURA), has been performed. Due to the small size of the individual cells, the aperture was built using additive manufacturing methods. The gamma-ray field was produced by a 137-Cs radioactive isotope at Lancaster University, UK. An organic plastic scintillator sample, which is capable of pulse shape discrimination, has been used to detect the gamma-ray field modulated by a tungsten aperture. Prior to the investigation of the aperture modulation properties, energy calibration of the scintillator was performed. Its pulse shape discrimination capabilities were verified using a 252-Cf fission source. In this study, each of 169 coded aperture cells were investigated by collimating the modulated gamma-ray field of 137-Cs through a 25.4 mm thick lead supporting plate. The supporting plate has one opening in the centre, of the same dimensions as the single aperture cell, i.e. 2.5 mm by 2.5 mm. The number of pulses detected for every aperture location were recorded in an array. The array was subsequently used to create a two-dimensional image of the source, which was encoded through the coded aperture pattern. Finally, the image was decoded using deconvolution techniques to reveal the actual source location. The new results obtained in this study indicate that sufficient gamma-ray modulation properties of the aperture can be determined, despite the relatively small footprint and thickness of the coded aperture.

AB - An investigation into the gamma-ray modulation properties of a tungsten coded aperture, whose design is based on the mathematical principles of Modified Uniformly Redundant Arrays (MURA), has been performed. Due to the small size of the individual cells, the aperture was built using additive manufacturing methods. The gamma-ray field was produced by a 137-Cs radioactive isotope at Lancaster University, UK. An organic plastic scintillator sample, which is capable of pulse shape discrimination, has been used to detect the gamma-ray field modulated by a tungsten aperture. Prior to the investigation of the aperture modulation properties, energy calibration of the scintillator was performed. Its pulse shape discrimination capabilities were verified using a 252-Cf fission source. In this study, each of 169 coded aperture cells were investigated by collimating the modulated gamma-ray field of 137-Cs through a 25.4 mm thick lead supporting plate. The supporting plate has one opening in the centre, of the same dimensions as the single aperture cell, i.e. 2.5 mm by 2.5 mm. The number of pulses detected for every aperture location were recorded in an array. The array was subsequently used to create a two-dimensional image of the source, which was encoded through the coded aperture pattern. Finally, the image was decoded using deconvolution techniques to reveal the actual source location. The new results obtained in this study indicate that sufficient gamma-ray modulation properties of the aperture can be determined, despite the relatively small footprint and thickness of the coded aperture.

KW - scintillators

KW - gamma detectors

KW - neutron detectors

KW - image processing

KW - scintillation

KW - light emission processes

U2 - 10.1088/1748-0221/14/02/P02007

DO - 10.1088/1748-0221/14/02/P02007

M3 - Journal article

VL - 14

JO - Journal of Instrumentation

JF - Journal of Instrumentation

SN - 1748-0221

M1 - P02007

ER -