Quantification estimate methods for synchrotron radiation X-ray fluorescence spectroscopy

Bewer, Brian

doi:10.1016/j.nimb.2015.01.041

Cited by 7 publications

(8 citation statements)

References 18 publications

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“…While the presence of Pb in bone may indicate that the subject was exposed to Pb while living, diagenesis could also be the source of Pb. Quantification of the lead levels using the confocal XFI image for sample B18 (Bewer ) yielded whole‐bone Pb concentration levels consistent with the ICP–MS level, though typically 10–25% lower. Of greater interest is the ability to glean localized Pb concentration methods from this method.…”

Section: Resultsmentioning

confidence: 68%

“…Moreover, localized quantitative information about the elements is available from confocal XFI maps given that self‐absorption of incident and fluorescent X‐rays can be estimated (De Samber et al . ; Bewer ). Quantitative elemental analysis may aid in the differentiation of acute or chronic exposure to toxic elements.…”

Section: Resultsmentioning

confidence: 99%

“…Confocal XAS may thus aid in differentiating between the biogenic and diagenetic nature of elements in archaeological samples by looking for differences in speciation of elements at specific structural features of the bone such as: osteon canal wall, cement line and periosteal surface. Moreover, localized quantitative information about the elements is available from confocal XFI maps given that self-absorption of incident and fluorescent X-rays can be estimated (De Samber et al 2010;Bewer 2015). Quantitative elemental analysis may aid in the differentiation of acute or chronic exposure to toxic elements.…”

Section: Resultsmentioning

confidence: 99%

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Confocal x‐ray Fluorescence Imaging Facilitates High‐Resolution Elemental Mapping in Fragile Archaeological Bone

et al. 2016

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Synchrotron‐based standard X‐ray fluorescence imaging can be a sophisticated tool for mapping distributions of trace elements in archaeological bone; however, thin samples are normally required to achieve high‐spatial‐resolution results. Poorly preserved or fragile archaeological samples can be challenging to measure using this standard technique, since the production of a sufficiently thin section may be difficult. We discuss the implementation of confocal X‐ray fluorescence imaging as a successful strategy for high‐resolution elemental mapping in poorly preserved archaeological bone. The implementation of the confocal method additionally can facilitate localized quantification and speciation of elements, which are also discussed.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Confocal x‐ray Fluorescence Imaging Facilitates High‐Resolution Elemental Mapping in Fragile Archaeological Bone

et al. 2016

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“…A key assumption of quantitative XRF is that the photons within the X-ray beam are uniformly distributed in a circular or square profile (Bewer, 2015;Kanngiesser, 2003). Such uniform profiles ensures equal sampling within the beam and across the sample surface.…”

Section: Introductionmentioning

confidence: 99%

“…Such uniform profiles ensures equal sampling within the beam and across the sample surface. In reality, it is difficult to produce a perfectly uniform beam shape, as synchrotron radiation is inherently structured as a result of the nature of the electron source (Bewer, 2015). A micro-or nano-X-ray beam is typically focused by a mirror system or zone plates.…”

Section: Introductionmentioning

confidence: 99%

Implications of X-ray beam profiles on qualitative and quantitative synchrotron micro-focus X-ray fluorescence microscopy

Morrell

Mosselmans

Geraki

et al. 2018

J Synchrotron Radiat

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Synchrotron radiation X-ray fluorescence microscopy is frequently used to investigate the spatial distribution of elements within a wide range of samples. Interrogation of heterogeneous samples that contain large concentration ranges has the potential to produce image artefacts due to the profile of the X-ray beam. The presence of these artefacts and the distribution of flux within the beam profile can significantly affect qualitative and quantitative analyses. Two distinct correction methods have been generated by referencing the beam profile itself or by employing an adaptive-thresholding procedure. Both methods significantly improve qualitative imaging by removing the artefacts without compromising the low-intensity features. The beam-profile correction method improves quantitative results but requires accurate two-dimensional characterization of the X-ray beam profile.

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Improving our understanding of metal implant failures: Multiscale chemical imaging of exogenous metals in ex-vivo biological tissues

et al. 2019

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Quantification estimate methods for synchrotron radiation X-ray fluorescence spectroscopy

Cited by 7 publications

References 18 publications

Confocal x‐ray Fluorescence Imaging Facilitates High‐Resolution Elemental Mapping in Fragile Archaeological Bone

Confocal x‐ray Fluorescence Imaging Facilitates High‐Resolution Elemental Mapping in Fragile Archaeological Bone

Implications of X-ray beam profiles on qualitative and quantitative synchrotron micro-focus X-ray fluorescence microscopy

Improving our understanding of metal implant failures: Multiscale chemical imaging of exogenous metals in ex-vivo biological tissues

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