Characterization of the new mobile confocal micro X-ray fluorescence (CXRF) system for in situ non-destructive cultural heritage analysis at the CNA: μXRF-CONCHA

Laclavetine, Kilian; Ager, F.J.; Arquillo, Joaquin; Respaldiza, M.Á.; Scrivano, S.

doi:10.1016/j.microc.2015.11.013

Cited by 21 publications

(7 citation statements)

References 36 publications

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“…However, one should realize this acquisition represents 20 min for a total of 69 696 8 × 8 μm 2 pixels: the equivalent of 17 ms/point/energy. This is a count rate far superior to what is usually applied in confocal measurements ,,− and very competitive to standard 3D XANES methodologies based on, for instance, tomographic reconstruction.…”

Section: Resultsmentioning

confidence: 88%

Application toward Confocal Full-Field Microscopic X-ray Absorption Near Edge Structure Spectroscopy

et al. 2017

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Using X-ray absorption near edge structure (XANES) spectroscopy, information on the local chemical structure and oxidation state of an element of interest can be acquired. Conventionally, this information can be obtained in a spatially resolved manner by scanning a sample through a focused X-ray beam. Recently, full-field methods have been developed to obtain direct 2D chemical state information by imaging a large sample area. These methods are usually in transmission mode, thus restricting the use to thin and transmitting samples. Here, a fluorescence method is displayed using an energy-dispersive pnCCD detector, the SLcam, characterized by measurement times far superior to what is generally applicable. Additionally, this method operates in confocal mode, thus providing direct 3D spatially resolved chemical state information from a selected subvolume of a sample, without the need of rotating a sample. The method is applied to two samples: a gold-supported magnesia catalyst (Au/MgO) and a natural diamond containing Fe-rich inclusions. Both samples provide XANES spectra that can be overlapped with reference XANES spectra, allowing this method to be used for fingerprinting and linear combination analysis of known XANES reference compounds.

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Section: Resultsmentioning

confidence: 88%

Application toward Confocal Full-Field Microscopic X-ray Absorption Near Edge Structure Spectroscopy

et al. 2017

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“…After its original introduction at synchrotron radiation facilities [97,[101][102][103][104][105], the feasibility of performing confocal XRF measurements using tube sources was demonstrated by several groups around the world [106][107][108][109][110], along with appropriate deconvolution, quantification, and simulation models [111][112][113][114][115][116][117][118]. Several papers have been recently been published where confocal XRF measurements are exploited for sub-surface examination of painted works of art [119][120][121][122][123][124], next to pottery [125], coins [86], stained glass [126,127], painted metal sheet [128], and natural rock samples [129]. About 10-15 years ago, the main advantages of SR-based l-XRF for the study of archaeological and artistic materials (such as glass, inks, enamel, metals) were considered to be its quantitative and non-destructive character combined with the possibility to perform trace analysis at the 1-10 ppm-level for transition element metals [130].…”

Section: _####_ Page 6 Of 51mentioning

confidence: 99%

Non-Invasive and Non-Destructive Examination of Artistic Pigments, Paints, and Paintings by Means of X-Ray Methods

et al. 2016

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Recent studies are concisely reviewed, in which X-ray beams of (sub)micrometre to millimetre dimensions have been used for non-destructive analysis and characterization of pigments, minute paint samples, and/or entire paintings from the seventeenth to the early twentieth century painters. The overview presented encompasses the use of laboratory and synchrotron radiation-based instrumentation and deals with the use of several variants of X-ray fluorescence (XRF) as a method of elemental analysis and imaging, as well as with the combined use of X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). Microscopic XRF is a variant of the method that is well suited to visualize the elemental distribution of key elements, mostly metals, present in paint multi-layers, on the length scale from 1 to 100 μm inside micro-samples taken from paintings. In the context of the characterization of artists' pigments subjected to natural degradation, the use of methods limited to elemental analysis or imaging usually is not sufficient to elucidate the chemical transformations that have taken place. However, at synchrotron facilities, combinations of μ-XRF with related methods such as μ-XAS and μ-XRD have proven themselves to be very suitable for such studies. Their use is often combined with microscopic Fourier transform infra-red spectroscopy and/or Raman microscopy since these methods deliver complementary information of high molecular specificity at more or less the same length scale as the X-ray microprobe techniques. Since microscopic investigation of a relatively limited number of minute paint samples, taken from a given work of art, may not yield representative information about the entire artefact, several methods for macroscopic, non-invasive imaging have recently been developed. Those based on XRF scanning and full-field hyperspectral imaging appear very promising; some recent published results are discussed.

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“…Successful application depends on the development of suitable instrumentation and Vandenabeele and Donais 259 reviewed the use of mobile spectroscopies in archaeometry, discussing the use of Raman, XRF, FTIR and LIBS spectrometries as well as less frequently used techniques. A new confocal m-XRF system for in situ nondestructive analysis in the cultural heritage eld was described by Laclavetine et al 260 The advantages of this instrument were evaluated in providing compositional and spatial information for the non-destructive measurement of depth proles of pictorial layers in old paintings. Kantarelou and Karydas 261 developed a simple calibration procedure for poly-capillarybased portable m-XRF spectrometers for the reliable quantitative analysis of cultural heritage artefacts.…”

Section: Archaeological and Cultural Heritagementioning

confidence: 99%

2016 Atomic Spectrometry Update – a review of advances in X-ray fluorescence spectrometry and its applications

West¹,

Ellis

Potts

et al. 2016

J. Anal. At. Spectrom.

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Characterization of the new mobile confocal micro X-ray fluorescence (CXRF) system for in situ non-destructive cultural heritage analysis at the CNA: μXRF-CONCHA

Cited by 21 publications

References 36 publications

Application toward Confocal Full-Field Microscopic X-ray Absorption Near Edge Structure Spectroscopy

Application toward Confocal Full-Field Microscopic X-ray Absorption Near Edge Structure Spectroscopy

Non-Invasive and Non-Destructive Examination of Artistic Pigments, Paints, and Paintings by Means of X-Ray Methods

2016 Atomic Spectrometry Update – a review of advances in X-ray fluorescence spectrometry and its applications

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