Full 3D position reconstruction of a radioactive source based on a novel hyperbolic geometrical algorithm

Panaino, C.M.V.; Mackay, Ranald I; Sotiropoulos, Marios; Kirkby, K.J.; Taylor, Michael

doi:10.1016/j.cpc.2019.107131

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…In this feasibility study, the 75 Se source was used in testing the viability of the imager. As shown in Figure 19, the source decay vertex can be determined using the estimated timedifference-of-arrival (TDOA) of the two cascade photons detected in coincidence and the global coordinates of the coincident detector pairs (Chiang et al, 2020;Panaino et al, 2020). Results show that the TOF-DuPECT imager is having a sensitivity of 0.4% (~4.0 × 10 -3 ).…”

Section: Cgc Imager Based On Time-of-flight (Tof) Informationmentioning

confidence: 99%

“…However, when there is a need for the precise location of an individual decaying nucleus, a different imaging approach is required. One of the important imaging approaches is the one based on cascade gamma-ray coincidence imaging (Spyrou et al, 2000;Shimazoe et al, 2017;Rangacharyulu et al, 2018;Santosh et al, 2019;Panaino et al, 2020;Rangacharyulu et al, 2020). Cascade gamma-ray coincidence (CGC) imaging is referred to as the instance whereby two gamma-ray photons from a single decay are detected in coincidence with a pair of detectors (Saffer et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

“…Cascade gamma-ray coincidence (CGC) imaging is referred to as the instance whereby two gamma-ray photons from a single decay are detected in coincidence with a pair of detectors (Saffer et al, 1992). As these gamma-ray cascades are emitted at the location where the nucleus is decaying, thus, event-by-event analysis determines the decay vertices of stationary nuclei, and also the emissions are devoid of blurring from random positron motions (Rangacharyulu et al, 2018;Panaino et al, 2020). These cascade gamma rays can potentially be detected in coincidence and may be used to create images based on the gamma-gamma coincidence imaging concept (Pahlka et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Review of the Imaging Performance and the Current Status of the Cascade Gamma-Rays Coincidence Imagers

Nkuba

Junior

Mohamed

et al. 2022

TJET

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Various studies that have investigated the detection of gamma coincidence events have revealed that design factors and image reconstruction approaches dictate the spatial resolution, coincidence efficiency, and levels of statistical noise of the detection system. In the case of imaging, cascade gamma-ray coincidence (CGC) imagers coupled with collimated detectors offer promising values for both spatial resolution and coincidence efficiency. However, to date, no CGC imager with single or multiple collimated detectors has reported a performance level beyond 6.7 mm spatial resolution (FWHM) and 6.0 ×1ncidence efficiency. Given the recent developments and the current interests in high resolution and localization of an individual decaying nucleus, there is a need for CGC imagers with higher performance in terms of spatial resolution and efficiency. Therefore, deploying a CGC imager coupled with multiple collimated detectors may prove to be of value in nuclear imaging and probably in clinical applications

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Section: Cgc Imager Based On Time-of-flight (Tof) Informationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Review of the Imaging Performance and the Current Status of the Cascade Gamma-Rays Coincidence Imagers

Nkuba

Junior

Mohamed

et al. 2022

TJET

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“…Using an appropriate mathematical model, such as Equation ( 5), counts from different sources and background (characterised by λ) can be generated [61]. Alternatively, Monte Carlo simulations of source-detector scenarios can be performed with computational models using software such as the GEANT4 package developed at CERN, which can output the energy (and total counts) deposited in detectors from user defined sources [69,70]. These methods of modeling screening systems provide a means for testing novel data processing algorithms (and detector materials in the case of Monte Carlo-based computational models) without requiring experimental data that can be be significantly more costly to obtain.…”

Section: Modelling Screening Systemsmentioning

confidence: 99%

Current and Prospective Radiation Detection Systems, Screening Infrastructure and Interpretive Algorithms for the Non-Intrusive Screening of Shipping Container Cargo: A Review

Connolly

Martin

2021

JNE

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The non-intrusive screening of shipping containers at national borders serves as a prominent and vital component in deterring and detecting the illicit transportation of radioactive and/or nuclear materials which could be used for malicious and highly damaging purposes. Screening systems for this purpose must be designed to efficiently detect and identify material that could be used to fabricate radiological dispersal or improvised nuclear explosive devices, while having minimal impact on the flow of cargo and also being affordable for widespread implementation. As part of current screening systems, shipping containers, offloaded from increasingly large cargo ships, are driven through radiation portal monitors comprising plastic scintillators for gamma detection and separate, typically 3He-based, neutron detectors. Such polyvinyl-toluene plastic-based scintillators enable screening systems to meet detection sensitivity standards owing to their economical manufacturing in large sizes, producing high-geometric-efficiency detectors. However, their poor energy resolution fundamentally limits the screening system to making binary “source” or “no source” decisions. To surpass the current capabilities, future generations of shipping container screening systems should be capable of rapid radionuclide identification, activity estimation and source localisation, without inhibiting container transportation. This review considers the physical properties of screening systems (including detector materials, sizes and positions) as well as the data collection and processing algorithms they employ to identify illicit radioactive or nuclear materials. The future aim is to surpass the current capabilities by developing advanced screening systems capable of characterising radioactive or nuclear materials that may be concealed within shipping containers.

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Ellipsoidal and hyperbolic Radon transforms; microlocal properties and injectivity

Webber

Holman

Quinto

2023

Journal of Functional Analysis

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Full 3D position reconstruction of a radioactive source based on a novel hyperbolic geometrical algorithm

Cited by 4 publications

References 21 publications

Review of the Imaging Performance and the Current Status of the Cascade Gamma-Rays Coincidence Imagers

Review of the Imaging Performance and the Current Status of the Cascade Gamma-Rays Coincidence Imagers

Current and Prospective Radiation Detection Systems, Screening Infrastructure and Interpretive Algorithms for the Non-Intrusive Screening of Shipping Container Cargo: A Review

Ellipsoidal and hyperbolic Radon transforms; microlocal properties and injectivity

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