Investigation into a suitable scintillator and coded-aperture material for a mixed-field radiation imaging system

Cieślak, M.; Gamage, Kelum A. A.; Glover, R.

doi:10.1088/1748-0221/12/12/p12007

Cited by 4 publications

(7 citation statements)

References 32 publications

(56 reference statements)

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“…Moreover, the presented scintillator could be matched to a position sensitive PMT (PSPMT), such as Hamamatsu H9500, to perform localisation of the particle interactions. Based on previously performed simulation work, it is believed that such system be capable of simultaneous neutron/gamma 2D imaging [15]. Moreover, because of the identical pixel size of the scintillator and cells of the PSPMT, the optical bond should be improved, and as a result the quality of neutron/gamma-ray separation.…”

Section: Discussionmentioning

confidence: 99%

Characterisation of a pixelated plastic scintillator for a coded aperture neutron/gamma imaging system

Cieślak

Gamage

2018

2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC)

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This paper experimentally investigates, the suitability of an organic pixelated plastic scintillator for a coded aperture neutron/gamma imaging system. The scintillator used in this study has been designed as a small scaled detector with an individual pixel size of 2.8 mm x 2.8 mm x 15 mm. Individual blocks of the scintillator have been separated from one another with ESR T M reector foil to provide over 70% of optical isolation between pixels. Individual scintillator cells are arranged into 13x13 array with overall dimension of 39.52 mm x 39.52 mm. In this study the scintillator was attached to a single channel photomultiplier tube to assess its pulse shape discrimination capabilities. Initially the scintillator was irradiated with 137 Cs gamma-ray source, and gamma-ray pulses were benchmarked with respect to a mathematical model. The detector was then irradiated with a spontaneous ssion source, 252 Cf, and preliminary results suggested good pulse shape discrimination potential of the scintillator. It is believed, that it is the rst time a small scale pixelated organic plastic scintillator has been tested in context of PSD capabilities for a coded aperture neutron/gamma imaging system.

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Section: Discussionmentioning

confidence: 99%

Characterisation of a pixelated plastic scintillator for a coded aperture neutron/gamma imaging system

Cieślak

Gamage

2018

2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC)

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“…The scintillator was designed so that it can match currently available pixelated photodetectors, such as the Hamamatsu H9500 PSPMTs or SensL series-J SiPMs. It was further customised to address a previously performed MCNP based simulation study of the coded-aperture based neutron/gamma imaging system [22]. The pixelated scintillator comprises 169 scintillator blocks arranged into a 13 × 13 array, as shown in figure 1.…”

Section: Organic Pixelated Plastic Scintillator Ej-299-34mentioning

confidence: 99%

“…Moreover, the mixed field environment created by a radioisotope can be affected by the way it is stored. Since the neutron source used for the present work is stored in a water tank, the average energy spectrum of 252 Cf has been reduced to approximately 0.7-0.9 MeV [22]. This has further impact on the neutron/gamma separation in the low energy region.…”

Section: Jinst 14 P07017mentioning

confidence: 99%

Pulse shape discrimination performance of a pixelated plastic scintillator (EJ-299-34) for a coded-aperture based dual particle imaging system

et al. 2019

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The pulse shape discrimination performance of a pixelated organic plastic scintillator has been investigated. The scintillator has been built using 169 plastic scintillator blocks (arranged into a 13 × 13 square array) of 2.8 × 2.8 × 15 mm3 each. The scintillator was coupled with a single-channel photomultiplier tube. The scintillator was exposed to a mixed-field environment provided by 252Cf and its pulse shape discrimination capabilities are presented in this paper. Initial results revealed that a 150 MS/s digitising system was insufficient to separate neutrons from gamma-ray photons. Therefore, the experiment was repeated with a 500 MS/s system, which provided improved pulse shape discrimination performance. In order to validate the performance of the pixelated plastic scintillator, it was compared to that of a cylindrical plastic sample. Tests were also carried out in moderated neutron and gamma-ray fields of 252Cf. The results indicate that acceptable levels of pulse shape discrimination are obtained for the case of a pixelated scintillator, when the higher sampling rate digitiser was used.

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“…Therefore, for the requirements of an empirical study, a material capable of blocking both neutrons and gamma-ray photons was sought. Our earlier Monte-Carlo simulation study revealed that a W-113 Cd composition (75%-25% ratio) provides optimal results [10]. However, due to safety concerns related to the handling of 113 Cd, a pure tungsten coded aperture was built for the present study and only tested in relation to gamma-ray modulation properties.…”

Section: Design Considerationsmentioning

confidence: 99%

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

et al. 2019

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Investigation into a suitable scintillator and coded-aperture material for a mixed-field radiation imaging system

Cited by 4 publications

References 32 publications

Characterisation of a pixelated plastic scintillator for a coded aperture neutron/gamma imaging system

Characterisation of a pixelated plastic scintillator for a coded aperture neutron/gamma imaging system

Pulse shape discrimination performance of a pixelated plastic scintillator (EJ-299-34) for a coded-aperture based dual particle imaging system

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

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