Characterization of a triple‐GEM position sensitive detector for X‐ray fluorescence imaging

Souza, G. G. A. de; Luz, H. Natal da

doi:10.1002/xrs.3068

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…For lower energies the position resolution also worsens due to the smaller signal-to-noise ratio. This has been studied for this detector and reported in [13]. The best result in terms of position resolution is 1.2 mm, achieved for the 8-9 keV range.…”

Section: Position Resolutionmentioning

confidence: 97%

XRF element localization with a triple GEM detector using resistive charge division

Souza

Luz

2019

Nuclear Instruments and Methods in Physics Research Section A:

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In this work we show the operation and results of an X-ray fluorescence imaging system using a cascade of three gas electron multipliers (GEM) and a pinhole assembly. The detector operates in Ar/CO 2 (90/10) at atmospheric pressure, with resistive chains applied to the strip readout, which allow to use only five electronic channels: two for each dimension and a fifth for energy and trigger. The corrections applied to the energy spectra to compensate for small changes in the signal amplitude and also differences in gain throughout the sensitive area are described and the clear improvement of the energy resolution is shown.To take advantage of the simultaneous sensitivity to the energy and to the position of interaction, a color scale matching the energy spectrum to the RGB range was applied, resulting in images where the color has a direct correspondence to the energy in each pixel and the intensity is reflected by the brightness of the image. The results obtained with four different color pigments are shown.

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Section: Position Resolutionmentioning

confidence: 97%

XRF element localization with a triple GEM detector using resistive charge division

Souza

Luz

2019

Nuclear Instruments and Methods in Physics Research Section A:

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“…The performance of FF-XRF camera based on CCD detector has been well studied in [8][9][10][11]. Gas electron multiplier (GEM) is an alternative type of detector for XRF imaging , while, the energy resolution of gaseous detectors has limitations when compared with solid-state detectors, due to the smaller number of electrons produced in each interaction, leading to higher statistical fluctuations in the primary cloud [20]. Besides CCD and GEM, hybrid pixel detectors made to operate in single-photon mode are known as hybrid photon counting detectors (HPCDs) [21,22].…”

Section: Introductionmentioning

confidence: 99%

Full-field X-ray fluorescence imaging with a straight polycapillary X-ray collimator

An¹,

Krapohl²,

Norlin³

et al. 2020

J. Inst.

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Due to the availability of X-ray imaging detectors, full-field X-ray fluorescence (FF-XRF) imaging technique has become achievable, which provides an alternative to scanning Xray fluorescence imaging with a micro-focus X-ray beamline. In this paper, we present a setup based on straight capillary optics and an energy-dispersive hybrid pixel detector, which can perform simultaneous mapping of several chemical elements. The photon transmission efficiency and spatial resolution are compared between two X-ray collimation setups: one using pinhole optics and one using straight polycapillary optics. There is a tradeoff between the spatial resolution and transmission efficiency when considering X-ray optics. When optimizing the spatial resolution, using straight capillary optics achieved a higher intensity gain when comparing with the pinhole setup. Characterization of the polycapillary imaging setup is performed through analyzing various samples in order to investigate the spatial-frequency response and the energy sensitivity. This developed setup is capable of FF-XRF imaging in characteristic energies below 20 keV, while for higher energies the spatial resolution is affected by photon transmission through the collimator. This work shows the potential of the FF-XRF instrument in the monitoring of toxic metal distributions in environmental mapping measurements.

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Characterization of a triple‐GEM position sensitive detector for X‐ray fluorescence imaging

Cited by 2 publications

References 15 publications

XRF element localization with a triple GEM detector using resistive charge division

XRF element localization with a triple GEM detector using resistive charge division

Full-field X-ray fluorescence imaging with a straight polycapillary X-ray collimator

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