Confocal X-ray technology based on capillary X-ray optics

Sun, Tao; Ding, Xunliang

doi:10.1515/revac-2015-0001

Cited by 17 publications

(6 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Flude et al . () reviewed benchtop micro‐XRF applications for assessing geological samples, while Sun and Ding () reviewed confocal X‐ray technology with capillary X‐ray optics, a technology gaining interest amongst geochemists.…”

Section: Developments In Instrumental Neutron Activation Analysis Andmentioning

confidence: 99%

GGR Biennial Critical Review: Analytical Developments Since 2014

Linge

Bèdard

Bugoi

et al. 2017

Geostandard Geoanalytic Res

View full text Add to dashboard Cite

This GGR biennial critical review covers developments and innovations in key analytical methods published since January 2014, relevant to the chemical, isotopic and crystallographic characterisation of geological and environmental materials. In nine selected analytical fields, publications considered to be of wide significance are summarised, background information is provided and their importance evaluated. In addition to instrumental technologies, this review also presents a summary of new developments in the preparation and characterisation of rock, microanalytical and isotopic reference materials, including a précis of recent changes and revisions to ISO guidelines for reference material characterisation and reporting. Selected reports are provided of isotope ratio analyses by both solution-nebulisation MC-ICP-MS and laser ablation-ICP-MS, as well as of radioactive isotope geochronology by LA-ICP-MS. Most of the analytical techniques elaborated continue to provide new applications for geochemical analysis, however it is noted that instrumental neutron activation analysis has become less popular in recent years, mostly due to the reduced availability of nuclear reactors to act as a neutron source. Many of the newer applications reported here provide analysis at increasingly finer resolution. Examples include atom probe tomography, a very sensitive method providing atomic scale information, nanoscale SIMS, for isotopic imaging of geological and biological samples, and micro-XRF, which has a spatial resolution many orders of magnitude smaller than conventional XRF

show abstract

Section: Developments In Instrumental Neutron Activation Analysis Andmentioning

confidence: 99%

GGR Biennial Critical Review: Analytical Developments Since 2014

Linge

Bèdard

Bugoi

et al. 2017

Geostandard Geoanalytic Res

View full text Add to dashboard Cite

show abstract

“…A specific sub-type of micro-XRF investigations are those employing a confocal excitation-detection geometry [96]. In this case, the recorded XRF signals stem from a well-defined cube-like ''sampling'' volume that is situated at the intersection of the X-ray optical devices positioned between X-ray source and sample (defining the primary beam) and between sample and X-ray detector (defining the direction from which XRF signals can enter the detector) [97].…”

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

View full text Add to dashboard Cite

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.

show abstract

“…The authors also considered the use of PCA which resulted in the improvement of S/N in m-XRF spectra, which in turn yielded improved spatial resolution in confocal m-XRF images as well as their development of a laboratory-based m-WDXRF spectrometer using a molybdenum target 2 to 3 kW X-ray tube and a spectrometer comprising parallel poly-capillary X-ray optics each side of the analyser crystal and a 2D X-ray detector. The resulting instrument offered excellent peak separation, as shown by the ability to resolve Ti K and Ba L lines in the same spectrum, and image acquisition times as short as 1 s. The second wide-ranging review 36 concentrated on the development of confocal m-XRF spectrometry but also usefully covered the use of confocal geometry in XAFS, m-XRD and small angle X-ray scattering. In the case of m-XRF spectrometry, the authors indicated that higher power laboratory sources and improved optics could lead to a spatial resolution of 0.5 mm.…”

Section: Laboratory Instruments and Excitation Sourcesmentioning

confidence: 99%