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5 results on '"Ryan, C. G."'

1. The Maia Detector and Event Mode.

Author

Ryan, C. G., Kirkham, R., de Jonge, M. D., Siddons, D. P., van der Ent, A., Pagés, A., Boesenberg, U., Kuczewski, A. J., Dunn, P., Jensen, M., Liu, W., Harris, H., Moorhead, G. F., Paterson, D. J., Howard, D. L., Afshar, N., Garrevoet, J., Spiers, K., Falkenberg, G., and Woll, A. R.

Subjects
*DETECTORS, *X-ray fluorescence, *FLUORESCENCE microscopy, *PHOTONS
Published
2018
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2. The X-ray Fluorescence Microscopy Beamline at the Australian Synchrotron.

Author

Paterson, D., de Jonge, M. D., Howard, D. L., Lewis, W., McKinlay, J., Starritt, A., Kusel, M., Ryan, C. G., Kirkham, R., Moorhead, G., and Siddons, D. P.

Subjects
SYNCHROTRONS, MICROCHEMISTRY, X-ray microscopy, ZONE plates, OPTICAL resolution, DETECTORS, X-ray absorption near edge structure
Abstract

A hard x-ray micro-nanoprobe has commenced operation at the Australian Synchrotron providing versatile x-ray fluorescence microscopy across an incident energy range from 4 to 25 keV. Two x-ray probes are used to collect μ-XRF and μ-XANES for elemental and chemical microanalysis: a Kirkpatrick-Baez mirror microprobe for micron resolution studies and a Fresnel zone plate nanoprobe capable of 60-nm resolution. Some unique aspects of the beamline design and operation are discussed. An advanced energy dispersive x-ray fluorescence detection scheme named Maia has been developed for the beamline, which enables ultrafast x-ray fluorescence microscopy. [ABSTRACT FROM AUTHOR]

Published
2011
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3. The Maia Spectroscopy Detector System: Engineering for Integrated Pulse Capture, Low-Latency Scanning and Real-Time Processing.

Author

Kirkham, R., Dunn, P. A., Kuczewski, A. J., Siddons, D. P., Dodanwela, R., Moorhead, G. F., Ryan, C. G., De Geronimo, G., Beuttenmuller, R., Pinelli, D., Pfeffer, M., Davey, P., Jensen, M., Paterson, D. J., de Jonge, M. D., Howard, D. L., Küsel, M., and McKinlay, J.

Subjects
SPECTRUM analysis, X-ray spectroscopy, PHOTONS, DETECTORS, FORCE & energy
Abstract

The Maia detector system is engineered for energy dispersive x-ray fluorescence spectroscopy and elemental imaging at photon rates exceeding 107/s, integrated scanning of samples for pixel transit times as small as 50μs and high definition images of 108 pixels and real-time processing of detected events for spectral deconvolution and online display of pure elemental images. The system developed by CSIRO and BNL combines a planar silicon 384 detector array, application-specific integrated circuits for pulse shaping and peak detection and sampling and optical data transmission to an FPGA-based pipelined, parallel processor. This paper describes the system and the underpinning engineering solutions. [ABSTRACT FROM AUTHOR]

Published
2010
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4. The New Maia Detector System: Methods For High Definition Trace Element Imaging Of Natural Material.

Author

Ryan, C. G., Siddons, D. P., Kirkham, R., Dunn, P. A., Kuczewski, A., Moorhead, G., De Geronimo, G., Paterson, D. J., de Jonge, M. D., Hough, R. M., Lintern, M. J., Howard, D. L., Kappen, P., and Cleverley, J.

Subjects
*IMAGING systems, *TRACE elements, *DECONVOLUTION (Mathematics), *SPECTRUM analysis, *DETECTORS
Abstract

Motivated by the need for megapixel high definition trace element imaging to capture intricate detail in natural material, together with faster acquisition and improved counting statistics in elemental imaging, a large energy-dispersive detector array called Maia has been developed by CSIRO and BNL for SXRF imaging on the XFM beamline at the Australian Synchrotron. A 96 detector prototype demonstrated the capacity of the system for real-time deconvolution of complex spectral data using an embedded implementation of the Dynamic Analysis method and acquiring highly detailed images up to 77 M pixels spanning large areas of complex mineral sample sections. [ABSTRACT FROM AUTHOR]

Published
2010
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5. Trends in hard X-ray fluorescence mapping: environmental applications in the age of fast detectors.

Author

Lombi, E., De Jonge, M. D., Donner, E., Ryan, C. G., and Paterson, D.

Subjects
DETECTORS, X-ray spectroscopy, TOMOGRAPHY, IMAGING systems, CHEMICAL speciation
Abstract

Environmental samples are extremely diverse but share a tendency for heterogeneity and complexity. This heterogeneity poses methodological challenges when investigating biogeochemical processes. In recent years, the development of analytical tools capable of probing element distribution and speciation at the microscale have allowed this challenge to be addressed. Of these available tools, laterally resolved synchrotron techniques such as X-ray fluorescence mapping are key methods for the in situ investigation of micronutrients and inorganic contaminants in environmental samples. This article demonstrates how recent advances in X-ray fluorescence detector technology are bringing new possibilities to environmental research. Fast detectors are helping to circumvent major issues such as X-ray beam damage of hydrated samples, as dwell times during scanning are reduced. They are also helping to reduce temporal beamtime requirements, making particularly time-consuming techniques such as micro X-ray fluorescence (μXRF) tomography increasingly feasible. This article focuses on μXRF mapping of nutrients and metalloids in environmental samples, and suggests that the current divide between mapping and speciation techniques will be increasingly blurred by the development of combined approaches. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Published
2011
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