A new fundamental parameter based calibration procedure for micro X-ray fluorescence spectrometers

Wolff, Timo de; Malzer, Wolfgang; Mantouvalou, Ioanna; Hahn, Oliver; Kanngießer, Birgit

doi:10.1016/j.sab.2011.01.009

Cited by 35 publications

(25 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar level of accuracy has been also reported in the quantification of micro‐XRF analyses when an indirect methodology was adopted for the determination of the lens transmission efficiency; Padilla et al quoted <15% deviations from the certified values of elements contained with >1% concentration in a set of glass and fused ore CRMs, whereas Wolff et al . found ±2% deviations for major elements (>10%), less than 10% for minor one (>0.25%) and within the range ±25% for elements with lower than 0.25% concentration.…”

Section: Resultsmentioning

confidence: 69%

“…A number of direct and indirect methods have been proposed towards an analytical description of the lens transmission efficiency . A direct determination of the X‐ray lens efficiency is based on the measurement of the energy distribution of the exciting beam at the focal spot of the X‐ray lens with and without the presence of the lens (using a pinhole, for example) .…”

Section: Introductionmentioning

confidence: 99%

“…Hodoroaba and Procop measured the lens transmission efficiency using the ratio of the measured–scattered spectrum (with the X‐ray lens) at two operational voltages versus the calculated one (without considering the X‐ray lens). Finally, Wolff et al determined the lens transmission efficiency by measuring a number of thin certified materials and applying an iterative fitting of the parameters of a logarithmic normal distribution. The proposed methodology included the fitting of the calculated lens transmission efficiencies at specific energies above the elements absorption edge.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A simple calibration procedure of polycapillary based portable micro‐XRF spectrometers for reliable quantitative analysis of cultural heritage materials

Kantarelou

Karydas

2015

X-Ray Spectrometry

View full text Add to dashboard Cite

Portable micro-X-ray fluorescence (micro-XRF) spectrometers mostly utilize a polycapillary X-ray lens along the excitation channel to collect, propagate and focus down to few tens of micrometers the X-ray tube radiation. However, the polycapillary X-ray lens increases the complexity of the quantification of micro-XRF data because its transmission efficiency is strongly dependent on the lens specifications and the propagated X-ray energy. This feature results to a significant and not easily predicted modification of the energy distribution of the primary X-ray tube spectrum. In the present work, we propose a simple calibration procedure of the X-ray lens transmission efficiency based on the fundamental parameters approach in XRF analysis. This analytical methodology is best suited for compact commercial and portable micro-XRF spectrometers. The developed calibration procedure is validated through the quantitative analysis of a broad range of samples with archeological relevance such as glasses, historical copper alloys, silver and gold alloys offering an overall accuracy of less than 10%-15%.

show abstract

Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A simple calibration procedure of polycapillary based portable micro‐XRF spectrometers for reliable quantitative analysis of cultural heritage materials

Kantarelou

Karydas

2015

X-Ray Spectrometry

View full text Add to dashboard Cite

show abstract

“…A corrected excitation spectrum of the instrument was measured by Timo Wolff and data processing utilized the PyMCA and DataMuncher software suites. [4,48,49] The total area scanned on the Pentecost (not shown) was 316 × 404 mm; details shown in Fig. 4 show spatial subsets of this scan, with histograms stretched to emphasize weak features.…”

Section: Scanning Xrf Spectroscopymentioning

confidence: 99%

An alternative approach to mapping pigments in paintings with hyperspectral reflectance image cubes using artificial intelligence

et al. 2020

View full text Add to dashboard Cite

Spectral imaging modalities, including reflectance and X-ray fluorescence, play an important role in conservation science. In reflectance hyperspectral imaging, the data are classified into areas having similar spectra and turned into labeled pigment maps using spectral features and fusing with other information. Direct classification and labeling remain challenging because many paints are intimate pigment mixtures that require a non-linear unmixing model for a robust solution. Neural networks have been successful in modeling non-linear mixtures in remote sensing with large training datasets. For paintings, however, existing spectral databases are small and do not encompass the diversity encountered. Given that painting practices are relatively consistent within schools of artistic practices, we tested the suitability of using reflectance spectra from a subgroup of well-characterized paintings to build a large database to train a one-dimensional (spectral) convolutional neural network. The labeled pigment maps produced were found to be robust within similar styles of paintings.

show abstract

“…Delgado et al obtained the spectral distribution of exciting radiation from measurements of XRF excited on a set of thick targets, combined with the mathematical methods of the Volterra integral equations. In the paper of Wolff et al, a micro‐XRF calibration procedure was described that is based on XRF measurements on thin samples and enables simultaneous determination of the polycapillary lens transmission function and of the detection solid angle. Perez et al elaborated a method for determination of the X‐ray tube excitation spectra that is based on the iterative deconvolution procedure of the fundamental parameter equations describing XRF intensities of a wide set of elements measured in thick standard samples.…”

Section: Introductionmentioning

confidence: 99%

Parametrization of a tabletop micro‐XRF system

Šmit

Prokeš

2019

X-Ray Spectrometry

View full text Add to dashboard Cite

A table‐top micro X‐ray fluorescence apparatus composed of a conventional X‐ray tube with a polycapillary lens and a silicon drift X‐ray detector was parametrized according to an independent parameter approach. The tube bremsstrahlung spectrum was calculated from the Bethe‐Heitler equation, convoluted by the energy distribution of radiating electrons in the target. In this paper, we propose a simple analytical approximation for this energy distribution. An analytical approximation is also proposed for transmission of the lens composed of curved capillaries.

show abstract

A new fundamental parameter based calibration procedure for micro X-ray fluorescence spectrometers

Cited by 35 publications

References 32 publications

A simple calibration procedure of polycapillary based portable micro‐XRF spectrometers for reliable quantitative analysis of cultural heritage materials

A simple calibration procedure of polycapillary based portable micro‐XRF spectrometers for reliable quantitative analysis of cultural heritage materials

An alternative approach to mapping pigments in paintings with hyperspectral reflectance image cubes using artificial intelligence

Parametrization of a tabletop micro‐XRF system

Contact Info

Product

Resources

About