X-ray microtome by fluorescence tomography

Simionovici, Alexandre; Chukalina, Marina; Günzler, F.; Schroer, Christian G.; Snigirev, A.; Snigireva, I.; Tümmler, J.; Weitkamp, Timm

doi:10.1016/s0168-9002(01)00512-5

Cited by 27 publications

(14 citation statements)

References 4 publications

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“…Examples are fluorescence X-ray tomography, recording element distributions down to trace level concentrations (e.g. Simionovici et al 2001); phase contrast X-ray tomography, which allows visualisation of discontinuities by phase shifts of a coherent X-ray beam, in materials with low attenuation coefficients (e.g. Cloetens et al 1997Cloetens et al , 1999, and diffraction X-ray tomography, which allows mapping of variations in mineralogical composition (e.g.…”

Section: Future Developmentsmentioning

confidence: 99%

Applications of X-ray computed tomography in the geosciences

et al. 2003

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X-ray computed tomography (CT) is a non-destructive technique with wide applications in various geological disciplines. It reveals the internal structure of objects, determined by variations in density and atomic composition. Large numbers of parallel 2D sections can be obtained, which allows 3D imaging of selected features. Important applications are the study of porosity and fluid flow, applied to investigations in the fields of petroleum geology, rock mechanics and soil science. Expected future developments include the combined use of CT systems with different resolutions, the wider use of related X-ray techniques and the integration of CT data with results of compatible non-destructive techniques.X-ray computed tomography (CT) is a nondestructive technique that allows visualization of the internal structure of objects, determined mainly by variations in density and atomic composition. It requires the acquisition of one-or two-dimensional radiographs for different positions during step-wise rotation around a central axis, whereby either the source and detector or the sample are moved. This is followed by the reconstruction of two-dimensional cross-sections perpendicular to the axis of rotation.CT images record differences in the degree of attenuation of the X-rays, which is materialand energy-dependent. The interactions that are responsible for this attenuation are mainly Compton scattering and photoelectric absorption. The contribution of the photoelectric effect depends on the effective atomic number and is especially important at low energies. At high energies, the Compton effect predominates and attenuation is mainly determined by density.X-ray CT was developed as a medical imaging technique in the early 1970s (Hounsfield 1972(Hounsfield , 1973. The possibility of its use in geology and engineering was soon recognised, resulting in large numbers of publications from the early 1980s onwards. Early applications include studies in the fields of soil science (Petrovic et al. In this introductory paper, we present some general information about the technique and a brief overview of its applications in geology, with references to some recent studies. More detailed information can be found in recent review articles by Duliu (1999) and Ketcham & Carlson (2001). Acquisition of transmission dataThe basic components of X-ray CT scanners are an X-ray source, a detector and a rotation system. Various possible configurations exist, whereby the selected configuration is determined by sample size and the desired resolution, besides availability and access restrictions. Ideally, the X-ray beam should be parallel rather than fanor cone-shaped (with a finite size of the origin), in which case the resolution is only determined by detector quality. High resolution (10 ~tm) can also be attained with microfocus X-ray tubes. Another aspect of acquisition is the energy spectrum of the X-ray source. Unless the X-rays are produced by radioactive decay, they are always polychromatic with a wide range in energy. This compli...

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Section: Future Developmentsmentioning

confidence: 99%

Applications of X-ray computed tomography in the geosciences

et al. 2003

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“…[1,2] SR-XFCT has been widely applied in the research field of phytology, materialology, geology, and particularly in biomedical studies [3][4][5][6][7][8] because of its higher sensitivity and lower detection limit superiorities. [7,9] Over the past two decades, many synchrotron radiation facilities have been equipped with XFCT imaging systems, such as APS, ESRF, SPring-8. [10][11][12] The common use of X-ray excitation energy (up to approximately 20 keV) has necessitated the use of L-shell fluorescence for high-Z elements (Z > 42).…”

Section: Introductionmentioning

confidence: 99%

Nondestructive rare earth element imaging of fish teeth from deep-sea sediments

Sun

Deng

et al. 2015

X-Ray Spectrom.

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X-ray fluorescence computed tomography is an emerging imaging modality that allows for the nondestructive reconstruction of the internal distribution of elements within a sample. The common use of X-ray excitation energy (up to approximately 20 keV) has necessitated the use of L-shell fluorescence for heavy elements. In this study, based on high energy X-ray at BL13W1 of the Shanghai Synchrotron Radiation Facility, we employed high-energy excitation for tomographic imaging of the heavy metals (rare earth elements) in fish teeth from deep-sea sediments on the micrometer scale using K-shell X-ray fluorescence. The virtual crosssectional distribution of La, Ce, Pm, Pr, Nd, and Sm were obtained, thereby providing a feasible approach for analyzing the enrichment mechanism of rare earth elements.

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“…In recent years, the confocal technology based on polycapillary X-ray optics has played an important role in 3-dimensional (3D) X-ray analysis [5][6][7]. This so-called confocal technology was first proposed in the early 1990s by Gibson and Kumakhov [8] and works by placing a polycapillary focusing X-ray lens (PFXRL) in the excitation channel and a polycapillary parallel X-ray lens (PPXRL) in the detection channel.…”

Section: Introductionmentioning

confidence: 99%