High energy transmission annular beam X-ray diffraction

Dicken, Anthony; Shevchuk, A. A.; Rogers, Keith; Godber, Simon X.; Evans, Paul

doi:10.1364/oe.23.006304

Cited by 17 publications

(16 citation statements)

References 22 publications

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“…This approach detects the presence of Bragg maxima from polycrystalline samples in the form of high intensity focal spots along the symmetry axis of the interrogating beam. This work encompassed angular dispersive methods realized by either translating the detector [14,15] or the sample [16] along the symmetry axis of the beam; the latter method employed pseudomonochromatic high energy X-rays (W-Kα) obtained via balance filtering [17]. We have also demonstrated an energy dispersive approach [18] in which both the sample and detector remain stationary to enable the recovery of high-energy polychromatic focal spots from a centrally positioned point detector.…”

Section: Theory Backgroundmentioning

confidence: 99%

X-ray absorption tomography employing a conical shell beam

Evans¹,

Godber²,

Elarnaut³

et al. 2016

Opt. Express

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Abstract:We demonstrate depth-resolved absorption imaging by scanning an object through a conical shell of X-rays. We measure ring shaped projections and apply tomosynthesis to extract optical sections at different axial focal plane positions. Three-dimensional objects have been imaged to validate our theoretical treatment. The novel principle of our method is scalable with respect to both scan size and X-ray energy. A driver for this work is to complement previously reported methods concerning the measurement of diffracted X-rays for structural analysis. The prospect of employing conical shell beams to combine both absorption and diffraction modalities would provide enhanced analytical utility and has many potential applications in security screening, process control and diagnostic imaging.

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Section: Theory Backgroundmentioning

confidence: 99%

X-ray absorption tomography employing a conical shell beam

Evans¹,

Godber²,

Elarnaut³

et al. 2016

Opt. Express

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“…All prior work with FCT has employed irradiance measurements using either quasi-monochromatic or pseudo-monochromatic X-rays as the basis for an angular dispersive method. These techniques detect the presence of Bragg maxima in the form of focal spots by either translating the detector [9,10] (with a fixed sample/source configuration) or translating the sample [11] (with a fixed detector/source position) along the principal axis. Thereby enabling the diffraction angle, 2θ, to be measured and the corresponding d-spacings to be calculated using the known geometric relationship between the source, sample and detector.…”

Section: Theory Backgroundmentioning

confidence: 99%

“…FCT has been shown to deal favorably with non-ideal samples such as those exhibiting large grain size, preferred orientation and liquid samples [12] that exhibit only short-range order. In addition, ADXRD tomography employing an annular beam has been demonstrated [13] as well as high energy versions (W-Kα) that employ balance filtering [11].…”

Section: Theory Backgroundmentioning

confidence: 99%

Energy-dispersive X-ray diffraction using an annular beam

Dicken¹,

Evans²,

Rogers³

et al. 2015

Opt. Express

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Abstract:We demonstrate material phase identification by measuring polychromatic diffraction spots from samples at least 20 mm in diameter and up to 10 mm thick with an energy resolving point detector. Within our method an annular X-ray beam in the form of a conical shell is incident with its symmetry axis normal to an extended polycrystalline sample. The detector is configured to receive diffracted flux transmitted through the sample and is positioned on the symmetry axis of the annular beam. We present the experiment data from a range of different materials and demonstrate the acquisition of useful data with sub-second collection times of 0.5 s; equating to 0.15 mAs. Our technique should be highly relevant in fields that demand rapid analytical methods such as medicine, security screening and non-destructive testing. 12. D. Prokopiou, K. Rogers, P. Evans, S. Godber, and A. Dicken, "Discrimination of liquids by a focal construct Xray diffraction geometry," Appl. Radiat. Isot. 77, 160-165 (2013). 13. P. Evans, K. Rogers, A. Dicken, S. Godber, and D. Prokopiou, "X-ray diffraction tomography employing an annular beam," Opt. Express 22(10), 11930-11944 (2014). 14. R. D. Luggar, J. A. Horrocks, R. D. Speller, and R. J. Lacey, "Determination of the geometric blurring of an energy dispersive X-ray diffraction (EDXRD) system and its use in the simulation of experimentally derived diffraction profiles," Nucl. Instrum. Methods Phys. Res., Sect. A 383(2-3), 610-618 (1996). 15. B. Ghammraoui, V. Rebuffel, J. Tabary, C. Paulus, L. Verger, and P. Duvauchelle, "Effect of grain size on stability of X-ray diffraction patterns used for threat detection," Nucl. Instrum. Methods Phys. Res., Sect. A 683, 1-7 (2012).

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“…A conical shell beam of radiation provides an extended specimen path that increases the number of crystallites in the correct orientation to produce relatively high intensity focal spots [16] and caustics in the diffracted flux [17]. This beam topology has been implemented successfully in energy [18] and angular dispersive modes [19][20][21], used to identify liquid samples [19], and shown to deal favorably with non-ideal samples in which scattering distributions are adversely affected by crystallographic textures e.g.…”

Section: Theory Backgroundmentioning

confidence: 99%

Depth resolved snapshot energy-dispersive X-ray diffraction using a conical shell beam

et al. 2017

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Abstract:We demonstrate a novel imaging architecture to collect range encoded diffraction patterns from overlapping samples in a single conical shell projection. The patterns were measured in the dark area encompassed by the beam via a centrally positioned aperture optically coupled to a pixelated energy-resolving detector. We show that a single exposure measurement of 0.3 mAs enables d-spacing values to be calculated. The axial positions of the samples were not required and the resultant measurements were robust in the presence of crystallographic textures. Our results demonstrate rapid volumetric materials characterization and the potential for a direct imaging method, which is of great relevance to applications in medicine, non-destructive testing and security screening. 457-460 (1987). 30. C. V. Pabón, P. Frutos, J. L. Lastres, and G. Frutos, "Application of differential scanning calorimetry and X-ray powder diffraction to the solid-state study of metoclopramide," J. Pharm. Biomed. Anal. 15(1), 131-138 (1996).

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High energy transmission annular beam X-ray diffraction

Cited by 17 publications

References 22 publications

X-ray absorption tomography employing a conical shell beam

X-ray absorption tomography employing a conical shell beam

Energy-dispersive X-ray diffraction using an annular beam

Depth resolved snapshot energy-dispersive X-ray diffraction using a conical shell beam

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