Comparison of Grazing Emission XRF with Total Reflection XRF and Other X-Ray Emission Techniques

Claes, Martine; Grieken, R. Van; Bokx, Pieter de

doi:10.1002/(sici)1097-4539(199707)26:4<153::aid-xrs195>3.0.co;2-1

Cited by 23 publications

(9 citation statements)

References 7 publications

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“…[1][2][3] In contrast to GI-XRF geometry, it is also possible to excite under normal incidence and detect the fluorescence radiation under glancing angles. 1,[4][5][6][7][8] This method is called "grazing exit," [8][9][10][11] "grazing emission" ͑GE-XRF͒, [5][6][7]12 or "glancing-takeoff" XRF 13,14 and is theoretically based on the reciprocity theorem. 4 The interference in this case is not between the exciting primary and reflected beam but among the superposition of the "primary" fluorescent waves emitted from the sample and reflected fluorescent radiation when observed under the critical angle of total reflection.…”

Section: Introductionmentioning

confidence: 99%

Grazing exit versus grazing incidence geometry for x-ray absorption near edge structure analysis of arsenic traces

Meirer

Pepponi

Streli

et al. 2009

Journal of Applied Physics

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In the presented study the grazing exit x-ray fluorescence was tested for its applicability to x-ray absorption near edge structure analysis of arsenic in droplet samples. The experimental results have been compared to the findings of former analyses of the same samples using a grazing incidence ͑GI͒ setup to compare the performance of both geometries. Furthermore, the investigations were accomplished to gain a better understanding of the so called self-absorption effect, which was observed and investigated in previous studies using a GI geometry. It was suggested that a normal incidence-grazing-exit geometry would not suffer from self-absorption effects in x-ray absorption fine structure ͑XAFS͒ analysis due to the minimized path length of the incident beam through the sample. The results proved this assumption and in turn confirmed the occurrence of the self-absorption effect for GI geometry. Due to its lower sensitivity it is difficult to apply the GE geometry to XAFS analysis of trace amounts ͑few nanograms͒ of samples but the technique is well suited for the analysis of small amounts of concentrated samples.

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Section: Introductionmentioning

confidence: 99%

Grazing exit versus grazing incidence geometry for x-ray absorption near edge structure analysis of arsenic traces

Meirer

Pepponi

Streli

et al. 2009

Journal of Applied Physics

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“…All the above improves the sensitivity of TXRF over conventional XRF techniques. In fact, while EDXRF and WDXRF typically have limits of detection of μg/L‐mg/L, TXRF reaches limits of detection of pg/L‐ng/L 7,8 …”

Section: Introductionmentioning

confidence: 99%

Analytical performance of Compton/Rayleigh signal ratio by total reflection X‐ray fluorescence (TXRF): A potential methodological tool for sample differentiation

et al. 2021

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The high sensitivity Compton and Rayleigh X‐ray scattering signals can be used to gain valuable information on the chemical composition of various matrices, by exploiting the ratio of those signals as a function of the effective atomic number (Zeff). Neither total reflection X‐ray fluorescence (TXRF) nor the effect of the experimental setup, including sample preparation, X‐ray excitation source selection, and band deconvolution procedure, has been assessed in this kind of approach. Here, a Compton/Rayleigh ratio and Zeff‐based TXRF method was set up and tested as an analytical tool for milk samples differentiation. The method was developed using a 90° scattering angle and assessed using different X‐ray excitation sources: a molybdenum tube (Mo Kα 17.5 KeV) and a tungsten tube (W Lα 8.5 KeV and W‐Brems 35 KeV). The evaluation of independent Compton and Rayleigh signals was performed by non‐Gaussian and Gaussian curve resolution methods, and both height and area‐based calculations were evaluated. Different sample preparation conditions were assessed. By using 11 standard materials, a calibration curve for Compton/Rayleigh ratio versus Zeff was established. The method was tested to determine the Zeff of milk samples, which enabled its use as a parameter to differentiate them. Good precisions were obtained with the Mo excitation source and the area‐based calculations, which allowed to differentiate undiluted milk samples by species, treatment, and fat content according to their Compton/Rayleigh ratio. This simple and rapid method has the potential to be used for the differentiation of various types of samples, including liquids, solids, and aerosols.

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“…The commercially available TXRF instruments have a good detection limit at the ppt level. 3 However, a lower detection limit has been required. One of the ways to improve the detection limit of TXRF analysis is to use more powerful x-ray sources, such as a rotating anode x-ray generator and synchrotron radiation.…”

Section: Introductionmentioning

confidence: 99%

Preliminary experiment of total reflection x-ray fluorescence using two glancing x-ray beams excitation

Tsuji

Sato

Wagatsuma

et al. 1999

Review of Scientific Instruments

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In conventional total reflection x-ray fluorescence ͑TXRF͒, one glancing x-ray beam irradiates the sample carrier for excitation of x-ray fluorescence. However, it is also possible to excite x-ray fluorescence by multiple x-ray beams. We performed a preliminary TXRF experiment excited by two independent glancing x-ray beams. The two x-ray beams excitation would be effective to enhance the intensity of x-ray fluorescence and to improve the detection limit in TXRF. X rays from both a rotating Mo anode x-ray tube and a glow discharge x-ray tube with an Fe target irradiated a Cr thin film sample on a quartz glass. The x-ray fluorescence of Cr K␣ from the sample was slightly enhanced compared with the intensity measured by one x-ray beam excitation.

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Comparison of Grazing Emission XRF with Total Reflection XRF and Other X-Ray Emission Techniques

Cited by 23 publications

References 7 publications

Grazing exit versus grazing incidence geometry for x-ray absorption near edge structure analysis of arsenic traces

Grazing exit versus grazing incidence geometry for x-ray absorption near edge structure analysis of arsenic traces

Analytical performance of Compton/Rayleigh signal ratio by total reflection X‐ray fluorescence (TXRF): A potential methodological tool for sample differentiation

Preliminary experiment of total reflection x-ray fluorescence using two glancing x-ray beams excitation

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