Spatial resolution properties of krypton-based mixtures using a 100 μm thick Gas Electron Multiplier

Roque, Rita Joanna da Cruz; Luz, H. Natal da; Carramate, L. F. N. D.; Azevedo, C.D.R.; Mir, J.A.; Amaro, F. D.

doi:10.1088/1748-0221/13/10/p10010

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…The typical value quoted for the edge response is the full width at half maximum (FWHM) [38][39][40]. A region of interest (ROI) perpendicular to the edge is selected.…”

Section: Spatial Resolutionmentioning

confidence: 99%

Characterization with X-rays of a Large-Area GEMPix Detector with Optical Readout for QA in Hadron Therapy

et al. 2021

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Quality Assurance (QA) in hadron therapy is crucial to ensure safe and accurate dose delivery to patients. This can be achieved with fast, reliable and high-resolution detectors. In this paper, we present a novel solution that combines a triple Gas Electron Multiplier (GEM) and a highly pixelated readout based on a matrix of organic photodiodes fabricated on top of an oxide-based thin-film transistor backplane. The first LaGEMPix prototype with an active area of 60 × 80 mm2 was developed and characterized using low energy X-rays. The detector comprises a drift gap of 3.5 mm, a triple-GEM stack for electron amplification, and a readout featuring 480 × 640 pixels at a 126 µm pitch. Here, we describe the measurements and results in terms of spatial resolution for various experimental configurations. A comparison with GAFCHROMIC® films and the GEMPix detector used in the charge readout mode was performed to better understand the contribution to the spatial resolution from both the electron diffusion and the isotropic emission of photons. The measurements were compared to Monte Carlo simulations, using the FLUKA code. The simulation predictions are in good agreement with the GEMPix results. Future plans with respect to applications in hadron therapy are discussed.

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“…The typical value quoted for the edge response is the full width at half maximum (FWHM) [38][39][40]. A region of interest (ROI) perpendicular to the edge is selected.…”

Section: Spatial Resolutionmentioning

confidence: 99%

Characterization with X-rays of a Large-Area GEMPix Detector with Optical Readout for QA in Hadron Therapy

et al. 2021

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“…The simulations performed with Thick-GEMs aimed at comparing the gain for different gas mixtures and operating conditions. Several mixtures were tested: two different mixtures of Ar/CO 2 (90/10 and 70/30), one mixture of Kr/CO 2 (90/10), used in detectors operating with higher energies X-rays (above 15 keV) [49] and the standard mixture planned for the upgraded ALICE TPC Ne/CO 2 /N 2 (90/10/5) [23]. The de-excitation of the noble gas to the ground state produces UV-photons that could generate secondary ionizations or even a continuous discharge inside the detector, which are undesired.…”

Section: Gain Curvesmentioning

confidence: 99%

X-Ray fluorescence imaging system based on Thick-GEM detectors

Souza¹

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AgradecimentosEste trabalho recebeu apoio financeiro da Fundação de Amparo à Pesquisa do Estado de São Paulo, com a bolsa FAPESP 2017/00426-9.My sincere thanks to the whole GDD lab at CERN, in special Leszek Ropelewski, Eraldo Oliveri, Patrik Thuiner and Florian Brunbauer.Gostaria de agradecer primeiramente ao professor Alexandre Suaide, por me introduzir ao grupo e pela ajuda nos mais diversos assuntos. À professora Marcia Rizzuto e à minha amiga Hellen Santos, pelo interesse nesse trabalho e troca de informações.Aos professores Marco Bregant, Marcelo Munhoz, Nelson Carlin, Tiago Fiorini, Mauro Cosentino e Zwinglio Guimarães pelas ideias e sugestões, tornando esse trabalho muito mais completo.Ao meu orientador e amigo, Hugo Natal da Luz, pelos ensinamentos, conselhos e paciência. Aos amigos que fiz durante a graduação e o mestrado, pela diversão, aprendizado e companhia durante todos esse anos. Um agradecimento especial aos amigos do grupo, Henrique, Milton, Camila, Chiara, Thais e Lucas. À minha familia, meus pais, Marco Aurélio e Maria Cabrine, e meu irmão Ramon, por toda confiança e suporte. Vocês são os melhores exemplos para mim. À Mayumi, pelo carinho e por estar ao meu lado nos melhores e piores momentos."All we have to decide is what to do with the time that is given us." -J.R.R. Tolkien, The Lord of The Rings Abstract GEMs (Gas Electron Multiplier) and Thick-GEMs (Thick-Gas Electron Multiplier) are MPGDs (Micropattern Gas Detector) that make part of the new generation of gaseous detectors, allowing high counting rates, low cost when compared to solid state detectors, high radiation hardness and gain when using multiple structures. Besides that, the handling and maintenance of these detectors is relatively simple, being versatile to detect different types of radiation. Therefore, these detectors are an effective alternative to build imaging systems with large sensitive area. This work consists in the study and characterization of a set of gaseous detectors, more specifically the Thick-GEMs produced in the High Energy Physics and Instrumentation Center at IFUSP, which were tested showing promising results in terms of gain, energy resolution and operational stability. However, due to the low signal-to-noise ratio of the Thick-GEMs, the X-ray fluorescence imaging system was mounted using GEMs. During this work the necessary software tools for image processing and reconstruction were developed as a parallel study in computational simulations to better understand the operation of gaseous detectors.X-ray fluorescence techniques are essential in areas such as medicine and the study of historical and cultural heritage since they are non-invasive and non-destructive. Techniques to check the authenticity of masterpieces are required and museums are gradually becoming more interested in the Physics and instrumentation needed to characterize their patrimony.

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Investigation on the performance of a thick ceramic gas electron multiplier

Muraro

Gorini

et al. 2022

Nuclear Instruments and Methods in Physics Research Section A:

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Spatial resolution properties of krypton-based mixtures using a 100 μm thick Gas Electron Multiplier

Cited by 5 publications

References 14 publications

Characterization with X-rays of a Large-Area GEMPix Detector with Optical Readout for QA in Hadron Therapy

Characterization with X-rays of a Large-Area GEMPix Detector with Optical Readout for QA in Hadron Therapy

X-Ray fluorescence imaging system based on Thick-GEM detectors

Investigation on the performance of a thick ceramic gas electron multiplier

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