A feasibility study of gamma ray source finder development for multiple sources scenario based on a Monte Carlo simulation

Alwars, Ali Farzanehpoor; Rahmani, Faezeh

doi:10.1038/s41598-021-85706-4

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…). This property is exploited by arrays of uncollimated detectors (Orion et al 1996;Shirakawa 2007) or equivalently, a single moving detector (Alwars & Rahmani 2021) to locate individual as well as multiple localized radioactive sources.…”

Section: Introductionmentioning

confidence: 99%

Annihilation-gamma-based diagnostic techniques for magnetically confined electron–positron pair plasma

von der Linden,

Nißl,

Deller

et al. 2023

J. Plasma Phys.

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Efforts are underway to magnetically confine electron–positron pair plasmas to study their unique behaviour, which is characterized by significant changes in plasma time and length scales, supported waves and unstable modes. However, use of conventional plasma diagnostics presents challenges with these low-density and annihilating matter–antimatter plasmas. To address this problem, we propose to develop techniques based on the distinct emission provided by annihilation. This emission exhibits two spatial correlations: the distance attenuation of isotropic sources and the back-to-back propagation of momentum-preserving 2 $\gamma$ annihilation. We present the results of our analysis of the $\gamma$ emission rate and the spatial profile of the annihilation in a magnetized pair plasma from direct pair collisions, from the formation and decay of positronium as well as from transport processes. In order to demonstrate the effectiveness of annihilation-based techniques, we tested them on annular $\gamma$ emission profiles produced by a $\beta ^+$ radioisotope on a rotating turntable. Direct and positronium-mediated annihilation result in overlapping volumetric $\gamma$ sources, and the 2 $\gamma$ emission from these volumetric sources can be tomographically reconstructed from coincident counts in multiple detectors. Transport processes result in localized annihilation where field lines intersect walls, limiters or internal magnets. These localized sources can be identified by the fractional $\gamma$ counts on spatially distributed detectors.

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Section: Introductionmentioning

confidence: 99%

Annihilation-gamma-based diagnostic techniques for magnetically confined electron–positron pair plasma

von der Linden,

Nißl,

Deller

et al. 2023

J. Plasma Phys.

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show abstract

“…The tolerance analysis is conventionally done using Monte Carlo (MC) method or its improved variants, which can be undoubtedly regarded as the standard reference technique for this purpose 4 . The next-generation of electrical and electronic equipment will consist of several complex units.…”

Section: Introductionmentioning

confidence: 99%

Crosstalk tolerance analysis of coupled-line structures using least square-support vector machine technique

Alijani,

Neshati

2023

Sci Rep

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In this paper, crosstalk sensitivity analysis of a microwave coupled-line structure due to the fabrication imperfections is investigated using Least Square-Support Vector Machine (LS-SVM) method. Since LS-SVM uses a set of linear equations instead of a convex quadratic programming problem, the computational cost is extremely reduced compared to that of the well-known Monte Carlo (MC) analysis or even Support Vector Machine (SVM) without decreasing the accuracy. Using this method, the geometrical parameters of the coupled-line are assumed to be randomly distributed using the Latin Hypercube function and the variation range of each parameter is set to ± 50% around its central value. The frequency response of the coupled-line is estimated and compared with those of the measured and simulation ones for a few well-known practical case studies. The results show that the LS-SVM procedure quickly predicts the worst-case crosstalk expectation values and accurately anticipates the probability of obtaining various outcomes of the coupled-line for the specified parameter variation over a wide frequency range.

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The coverage and detection limit of a sampling point for robotics radiation mapping

Rahman

Sahari

Baharuddin

2023

Applied Radiation and Isotopes

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A feasibility study of gamma ray source finder development for multiple sources scenario based on a Monte Carlo simulation

Cited by 6 publications

References 13 publications

Annihilation-gamma-based diagnostic techniques for magnetically confined electron–positron pair plasma

Annihilation-gamma-based diagnostic techniques for magnetically confined electron–positron pair plasma

Crosstalk tolerance analysis of coupled-line structures using least square-support vector machine technique

The coverage and detection limit of a sampling point for robotics radiation mapping

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