Examples of XRF and PIXE imaging with few microns resolution using SLcam® a color X‐ray camera

Nowak, S.; Bjeoumikhov, A.; Borany, J. von; Buchriegler, Josef; Munnik, F.; Petrič, M.; Renno, Axel D.; Radtke, Martin; Reinholz, Uwe; Scharf, Oliver; Strüder, L.; Wedell, R.; Ziegenrücker, René

doi:10.1002/xrs.2590

Cited by 17 publications

(12 citation statements)

References 17 publications

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“…on the other hand, SDD provides an excellent energy resolution with high count rates. [28,29,38] The continuous developments in X-ray tubes and detectors allowed the manufacturers to build reliable handheld portable-XRF systems well equipped with Peltier-cooled SDDs and X-ray tubes having 50 kV maximum voltage. With the use of portable vacuum pumps, the sensitivity of the spectrometers was enhanced especially to detect lighter elements having low atomic numbers (Z).…”

Section: X-ray Fluorescence (Xrf) Analysis: Instrumentationmentioning

confidence: 99%

Application of X‐ray fluorescence spectrometry in plant science: Solutions, threats, and opportunities

Singh

Sharma

Singh³

2021

X-Ray Spectrometry

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X‐ray fluorescence (XRF) spectrometry is a nondestructive, rapid, simultaneous multi‐elemental imaging methodology for plant materials. Its applications are broad and cover most of the elements with varying concentration below the parts per million (ppm). XRF is a well‐established atomic spectrometric technique that is also being used as a field portable instrumentation. In recent decades, XRF has been considered a very versatile tool for plant nutrition diagnosis due to its fast and multi‐elemental analytical imaging response directly from a solid sample. In this review, we have mainly focused on the recent developments and advancements in XRF spectrometry to analyze plant materials. We have also included the fundamental aspects and instrumentation for XRF spectrometry for its use in plants imaging. We have also covered the use of XRF for vegetal tissues and plant leaves. Mainly, we have briefly focused on some features of sampling procedures and calibration strategies regarding the use of XRF for plant tissues. Microchemical imaging applications by XRF, μ‐XRF, μ‐SRXRF, and TXRF have been covered for a wide variety of plant tissues such as leaves, roots, stems, and seeds.

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Section: X-ray Fluorescence (Xrf) Analysis: Instrumentationmentioning

confidence: 99%

Application of X‐ray fluorescence spectrometry in plant science: Solutions, threats, and opportunities

Singh

Sharma

Singh³

2021

X-Ray Spectrometry

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“…Meanwhile, this full‐field camera has found use in different fields of application—for example, X‐ray absorption near‐edge structure spectroscopy or X‐ray transmission radiography and tomography . With respect to lateral resolution, an overview of the available varieties and applications of such systems, also known under its trademark name SLcam ® , is given in previous studies …”

Section: Introductionmentioning

confidence: 99%

“…The focus is on improving the lateral resolution and overcoming optics artefacts without impeding further developments in terms of quantification. The imaging enhancements presented in this paper are image‐stacking, multiframe super‐resolution, which is closely related to image‐stacking, flat‐field correction, and the previously described subpixel correction, for example, Nowak et al All enhancements were accomplished on data gathered with the full‐field PIXE set‐up at HZDR.…”

Section: Introductionmentioning

confidence: 99%

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

et al. 2018

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The combination of a pn‐junction charge‐coupled device‐based pixel detector with a poly‐capillary X‐ray optics was installed and examined at the Helmholtz‐Zentrum Dresden‐Rossendorf. The set‐up is intended for particle‐induced X‐ray emission imaging to survey the trace elemental composition of flat/polished geological samples. In the standard configuration, a straight X‐ray optics (20 μm capillary diameter) is used to guide the emitted photons from the sample towards the detector with nearly 70 000 pixels. Their dimensions of 48 × 48 μm2 are the main limitation of the lateral resolution. This limitation can be bypassed by applying a dedicated subpixel algorithm to recalculate the footprint of the photon's electron cloud in the detector. The lateral resolution is then mainly determined by the capillary's diameter. Nevertheless, images are still superimposed by the X‐ray optics pattern. The optics' capillaries are grouped in hexagonal bundles resulting in a reduced transmission of X‐rays in the boundary regions. This influence can be largely suppressed by combining a series of short measurements at slightly shifted positions using a precision stage and correcting the image data for this shifting. The use of a subpixel grid for the image reconstruction allows a further increase of the spatial resolution. This approach of image‐stacking and multiframe super‐resolution in combination with the subpixel correction algorithm is presented and illustrated with experimental data. Additionally, a flat‐field correction is shown to remove the remaining imaging inhomogeneity caused by non‐uniform X‐ray transmission. The described techniques can be used for all X‐ray spectrometry methods using an X‐ray camera to obtain high‐quality elemental images.

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“…Single photon counting mode is achievable even at relatively high photon count rates as available at synchrotron or PIXE endstations. 15 A standalone pnCCD is used for spatially resolved X-ray transmission 16 , diffraction 17 or scattering measurements 18 . However, in order to achieve an image of X-ray fluorescence, X-ray photons should be explicitly guided from small regions on a sample to corresponding pixels on a detector.…”

Section: Introductionmentioning

confidence: 99%

Road to micron resolution with a color X-ray camera -- polycapillary optics characterization

Nowak,

Petric,

Buchriegler

et al. 2017

Preprint

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In a color X-ray camera spatial resolution is achieved by means of a polycapillary optic conducting X-ray photons from small regions on a sample to distinct energy dispersive pixels on a CCD matrix. At present, the resolution limit of color X-ray camera systems can go down to several microns and is mainly restricted by pixel dimensions. The recent development of an efficient subpixel resolution algorithm allows a release from pixel size, limiting the resolution only to the quality of the optics. In this work polycapillary properties that influence the spatial resolution are systematized and assessed both theoretically and experimentally. It is demonstrated that with the current technological level reaching one micron resolution is challenging, but possible.

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Examples of XRF and PIXE imaging with few microns resolution using SLcam® a color X‐ray camera

Cited by 17 publications

References 17 publications

Application of X‐ray fluorescence spectrometry in plant science: Solutions, threats, and opportunities

Application of X‐ray fluorescence spectrometry in plant science: Solutions, threats, and opportunities

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

Road to micron resolution with a color X-ray camera -- polycapillary optics characterization

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