Doubly curved crystal (DCC) X-ray optics and applications

Chen, Zewu; Gibson, W. M.

doi:10.1154/1.1482367

Cited by 21 publications

(13 citation statements)

References 14 publications

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“…It uses a "High Definition" XRF (HDXRF) technique that includes Doubly Curved Crystal (DCC) optics to enhance measurement intensities [15]. Furthermore, it is housed in a unique, self-contained case designed for transportation to and use in the field.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Evaluation of a new optic-enabled portable X-ray fluorescence spectrometry instrument for measuring toxic metals/metalloids in consumer goods and cultural products

Guimarães

Praamsma

Parsons

2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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X-ray fluorescence spectrometry (XRF) is a rapid, non-destructive multi-elemental analytical technique used for determining elemental contents ranging from percent down to the µg/g level. Although detection limits are much higher for XRF compared to other laboratory-based methods, such as inductively coupled plasma mass spectrometry (ICP-MS), ICP-optical emission spectrometry (OES) and atomic absorption spectrometry (AAS), its portability and ease of use makes it a valuable tool, especially for field-based studies. A growing necessity to monitor human exposure to toxic metals and metalloids in consumer goods, cultural products, foods and other sample types, and while performing the analysis in situ has led to several important developments in portable XRF technology. In this study, a new portable XRF analyzer based on the use of doubly curved crystal optics (HD Mobile ® ) was evaluated for detecting toxic elements in foods, medicines, cosmetics and spices used in many Asian communities. Two models of the HD Mobile ® (a pre-production and a final production unit) were investigated. Performance parameters including accuracy, precision and detection limits were characterized in a laboratory setting using certified reference materials (CRMs) and standard solutions. Bias estimates for key elements of public health significance such as As, Cd, Hg and Pb ranged from -10% to 11% for the pre-production, and -14% to 16% for the final production model. Five archived public health samples including herbal medicine products, ethnic spices and cosmetic products were analyzed using both XRF instruments. There was good agreement between the pre-production and final production models for the four key elements, such that the data were judged to be fit-for-purpose for the majority of samples analyzed. Detection of the four key elements of interest using the HD Mobile ® was confirmed using archived samples for which ICP-OES data were available based on digested sample materials. The HD Mobile ® XRF units were shown to be suitable for rapid screening of samples likely to be encountered in field based studies.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Evaluation of a new optic-enabled portable X-ray fluorescence spectrometry instrument for measuring toxic metals/metalloids in consumer goods and cultural products

Guimarães

Praamsma

Parsons

2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…DCC optics, which utilize Bragg diffraction, have continued to evolve in design and application 6,7,8 . The basic "symmetric" design, which uses a torroidaly shaped DCC optic is shown in Figure 2.…”

Section: Doubly Curved Crystal (Dcc) Opticsmentioning

confidence: 99%

X-ray optics: an enabling technology for science, medicine, and industry

Gibson

Chen

Gao

et al. 2005

Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II

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Polycapillary and doubly curved crystal (DCC) optics coupled with small spot x-ray sources in a special X-Beam ® package provide compact, high-sensitivity, low-power, highly stable subsystems that can be used for in situ analyzers. These analyzers provide remote, unattended use for environmental applications, bench-top or in-line instruments for industrial applications, and point-of-care clinical instruments for medical diagnosis or monitoring. Micro x-ray fluorescence (µXRF) and monochromatic micro x-ray fluorescence (MµXRF) can be used to measure trace element concentrations and distributions. Parallel-beam and convergent-beam x-ray diffraction (XRD) can be used for in situ phase composition, texture, strain, and crystal structure measurements.

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“…The improved performance results from the use of a doubly curved crystal optic (DCC) (X-ray Optical Systems (XOS) Inc, East Greenbush, NY) to focus the X-rays, and thus increase the usable flux (1×10 9 photons/s) from a standard laboratory source. 13,14 Signal to background ratios (i.e., the specific element peaks above Bremsstrahlung continuum) are substantially improved. 10 Mµ-XRF with DCC thus provides a new opportunity for determining the spatial distribution of both major and trace elements at micrometer-scale resolution in solid materials, including biological tissues.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the microdistribution of strontium and lead in bone via benchtop monochromatic microbeam X-ray fluorescence with a low power source

Bellis

Li²,

Chen³

et al. 2009

J. Anal. At. Spectrom.

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Summary Determination of the microdistribution of trace elements in bone at low concentrations has previously been performed with proton induced X-ray emission (PIXE), high-energy synchrotron source X-ray fluorescence (XRF) and laser ablation - inductively coupled plasma mass spectrometry (LA-ICP-MS). Several commercial benchtop XRF systems with micrometer-scale resolution are currently available. While providing convenient, non-destructive mapping capability, they appear to lack the sensitivity required for detection of trace elements in biological tissues such as bone. We investigated the application of a prototype benchtop XRF system for the measurement of strontium and lead at physiological levels in bone. Detection of several elements of interest, including Sr and Pb was achieved with an experimental set up based on focused monochromatic microbeam X-ray fluorescence (Mµ-XRF) instrumentation with a low power source (45 W molybdenum tube) coupled to doubly curved crystal (DCC) optics. A cross-section of bone about 5 mm × 8 mm size was mapped with 80-µm resolution showing heterogeneous distribution of Sr and Pb. The data showed that Mµ-XRF coupled to DCC is powerful method for measurement of the spatial distribution of trace elements in bone.

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Doubly curved crystal (DCC) X-ray optics and applications

Cited by 21 publications

References 14 publications

Evaluation of a new optic-enabled portable X-ray fluorescence spectrometry instrument for measuring toxic metals/metalloids in consumer goods and cultural products

Evaluation of a new optic-enabled portable X-ray fluorescence spectrometry instrument for measuring toxic metals/metalloids in consumer goods and cultural products

X-ray optics: an enabling technology for science, medicine, and industry

Measurement of the microdistribution of strontium and lead in bone via benchtop monochromatic microbeam X-ray fluorescence with a low power source

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