Optimization of GEM detectors for applications in X-ray fluorescence imaging

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL Radiation Physics and Chemistry Pub Date : 2024-09-29 DOI:10.1016/j.radphyschem.2024.112263

G.G.A. de Souza , H.N. da Luz , M. Bregant

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Abstract

In this work a set of simulations that aim at the optimization of Micropattern Gaseous Detectors (MPGD) for applications in X-ray fluorescence imaging in the energy range of 3 – 30 keV is presented. By studying the statistical distribution of electrons from interactions of X-rays with gases, the energy resolution limits after charge multiplication for 6 keV X-ray photons in Ar/CO

_{2}

(70/30) and Kr/CO

_{2}

(90/10) were calculated, resulting in energy resolutions of 15.4(4)% and 14.6(2)% respectively. These two mixtures were studied in simulations to evaluate the advantages of using krypton-based mixtures to reduce the presence of escape peaks in fluorescence spectra. A model to evaluate the X-ray fluorescence from the conductive materials inside the detectors was implemented, serving as a tool to estimate the extent of contamination of fluorescence spectra when using copper or aluminum layers in the material composition of MPGDs.

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优化 GEM 探测器在 X 射线荧光成像中的应用

在这项工作中，介绍了一系列旨在优化微图案气体探测器（MPGD）的模拟，以应用于能量范围为 3-30 千伏的 X 射线荧光成像。通过研究 X 射线与气体相互作用产生的电子的统计分布，计算了 Ar/CO2(70/30)和 Kr/CO2(90/10)中 6 keV X 射线光子电荷倍增后的能量分辨率极限，结果是能量分辨率分别为 15.4(4)% 和 14.6(2)%。对这两种混合物进行了模拟研究，以评估使用氪基混合物减少荧光光谱中逸出峰的优势。还建立了一个模型来评估探测器内部导电材料产生的 X 射线荧光，该模型可作为一种工具，用于估算在 MPGD 的材料成分中使用铜层或铝层时荧光光谱的污染程度。

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.