Elemental mapping in a contemporary miniature by full-field X-ray fluorescence imaging with gaseous detector vs. scanning X-ray fluorescence imaging with polycapillary optics

Silva, Ana Luísa; Cirino, Sérgio Dias; Carvalho, Luísa; Manso, Marta; Pessanha, Sofia; Azevedo, C.D.R.; Carramate, L. F. N. D.; Santos, J. P.; Guerra, Mauro; Veloso, J.F.C.A.

doi:10.1016/j.sab.2016.12.006

Cited by 19 publications

(14 citation statements)

References 22 publications

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“…Obviously, the irradiance applied in our experiments was not high enough due to the limited maximum energy of the laser. Another issue is the inhomogeneous desorption process for different elements at the laser irradiance of 10 7 to 10 8 W/cm . In this manuscript, the objective of the work is focused on integrally optimizing LD‐LPI‐MS for spectral resolution, LODs, and sample consumption; therefore, non‐uniform phenomenon tends to arise.…”

Section: Resultsmentioning

confidence: 99%

“…Another issue is the inhomogeneous desorption process for different elements at the laser irradiance of 10 7 to 10 8 W/cm. 2,24,25,55 In this manuscript, the objective of the work is focused on integrally optimizing LD-LPI-MS for spectral resolution, LODs, and sample consumption; therefore, non-uniform phenomenon tends to arise. Further work remains to be done to improve the quantitative capability of the LD-LPI technique.…”

Section: Improved Detection Sensitivity Of Elements In Standard Allmentioning

confidence: 99%

“…Optical and mass spectrometric methods have been developed for the direct determination of trace elements in solids. For optical methods, the representative techniques are X‐ray fluorescence (XRF), glow discharge optical emission spectrometry (GD‐OES), laser‐induced fluorescence (LIF), and laser‐induced breakdown spectrometry (LIBS) . Some drawbacks related to these optical techniques are intricate spectral interference, high background level, and relatively high limit of detection (LOD).…”

Section: Introductionmentioning

confidence: 99%

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Improved detection sensitivity of elements in solids via laser postionization in laser desorption time‐of‐flight mass spectrometry

et al. 2018

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A newly constructed laser desorption (532 nm, 5 ns) and laser postionization (266 nm, 5 ns) time-of-flight mass spectrometer (LD-LPI-TOFMS) has been applied for improving the detection sensitivity of elements in solid samples. This method affords to acquire the information of the elemental impurities in solid standards as well as limit of detection (LOD) down to 10 g/g for some elements. Neutral atoms of solids are generated by low-irradiance laser desorption (< 10 W/cm ), followed by high-irradiance laser postionization (~ 10 W/cm ) of the desorbed atoms, facilitating to decouple the desorption and ionization processes in spatial and temporal domain. This non-interacting feature overcomes the discrimination between deteriorating spectral resolution at high irradiance (10 -10 W/cm ) and limited detectable elemental species and high LOD at low or medium irradiance (below 10 W/cm ). The utilization of originally "wasted" neutral atoms by laser postionization will help improve atom utilization and instrumental sensitivity. In this work, getting the utmost out of the consumed neutral atoms instead of an increment in sampling amounts is given attention with high priority for achieving high sensitivity and low LOD, which is especially useful on the occasions where very low sample consumption is desired.

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Section: Resultsmentioning

confidence: 99%

Section: Improved Detection Sensitivity Of Elements In Standard Allmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved detection sensitivity of elements in solids via laser postionization in laser desorption time‐of‐flight mass spectrometry

et al. 2018

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“…Distribution maps of calcium, copper, and gold, elements present in the used paints, were obtained. Another EDXRFI system configuration based on a 2D-THCOBRA detector (in a neon-methane atmosphere, with a 10 × 10 cm 2 active area) was used to study the elemental distribution in a contemporary Indian miniature [18]. Different regions were analysed and the results compared with results from acquisitions made with a Micro-XRF spectrometer, the M4 TORNADO (Bruker, Germany).…”

Section: Introductionmentioning

confidence: 99%

Elemental mapping of Portuguese ceramic pieces with a full-field XRF scanner based on a 2D-THCOBRA detector

et al. 2021

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In this work, we present a novel application of the full-field energy-dispersive Xray fluorescence (EDXRF) imaging system based on a MicroPattern Gaseous Detector (2D-THCOBRA) in the cultural heritage field. The detector has an intrinsic imaging capability with spatial resolution of 400 µm FWHM, and is energy sensitive, presenting an energy resolution of approximately 1 keV FWHM at 5.9 keV. The full-field XRF scanner based on the 2D-THCOBRA detector allows mapping the distribution of elements in large area samples with high detection efficiency (75% at 5.9 keV), being a very promising choice for elemental mapping analysis of large area cultural heritage samples. In this work, we have demonstrated the imaging capabilities of the full-field XRF scanner and used it to assess the restoration of a Portuguese faience piece.

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“…The GEM detectors are the most popular and widely used Micro-Pattern Gaseous Detectors (MPGD) [9][10][11][12], which are suitable for X-ray spectral imaging, despite their limited energy resolution [13,14]. They are very robust and rather easy to assemble from prefabricated components, with a variety of configurable options, allowing the sensor parameters to be adjusted to the specific requirements [15][16][17][18][19][20][21][22][23][24][25]. A standard GEM detector is assembled of copper-rich components.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Copper-Less Gas Electron Multiplier Detectors Responses to Soft X-rays

Mindur

Fiutowski

Koperny

et al. 2020

Sensors

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In this paper, we report on the systematic study of different variants of X-ray detectors based on Gas Electron Multiplier (GEM) technology using modified GEM foils with greatly reduced amount of copper. The main goal of this study was understanding the performance of such detectors applied in X-Ray Fluorescence (XRF) elemental analysis. Reduction of the amount of copper in the detector structure is crucial for suppression of XRF background from copper, but one has to ensure that key detector parameters are not affected by such modification. The tested detector variants include detectors with different types of copper-less GEM foils, which have been manufactured starting from standard copper-clad foils and removing partially the copper layer in additional post-processing steps. The results are analyzed and discussed with a particular focus on the energy resolution, uniformity of gas gain and energy resolution across the detector area, and on the long-term stability of the gas gain. Long-term stability tests performed for selected detectors do not indicate for any accelerated aging of the copper-less detectors compared to standard detectors using copper-clad GEM foils. The presented results lead us to conclude that the copper-less GEM detectors are promising devices to suppress the XRF background.

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Elemental mapping in a contemporary miniature by full-field X-ray fluorescence imaging with gaseous detector vs. scanning X-ray fluorescence imaging with polycapillary optics

Cited by 19 publications

References 22 publications

Improved detection sensitivity of elements in solids via laser postionization in laser desorption time‐of‐flight mass spectrometry

Improved detection sensitivity of elements in solids via laser postionization in laser desorption time‐of‐flight mass spectrometry

Elemental mapping of Portuguese ceramic pieces with a full-field XRF scanner based on a 2D-THCOBRA detector

Investigation of Copper-Less Gas Electron Multiplier Detectors Responses to Soft X-rays

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