Author: "De Geronimo, G." / Topic: x-ray microprobe - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "De Geronimo, G." Topic x-ray microprobe

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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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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Author: Ryan, C.G., Kirkham, R., Hough, R.M., Moorhead, G., Siddons, D.P., de Jonge, M.D., Paterson, D.J., De Geronimo, G., Howard, D.L., and Cleverley, J.S.
Subjects: *NUCLEAR counters, *X-rays, *SOLID geometry, *QUANTITATIVE research, *IMAGING systems, *COMPUTER software, *PROTOTYPES, *SYNCHROTRON radiation
Abstract: Abstract: The fundamental parameter method for quantitative SXRF and PIXE analysis and imaging using the dynamic analysis method is extended to model the changing X-ray yields and detector sensitivity with angle across large detector arrays. The method is implemented in the GeoPIXE software and applied to cope with the large solid-angle of the new Maia 384 detector array and its 96 detector prototype developed by CSIRO and BNL for SXRF imaging applications at the Australian and NSLS synchrotrons. Peak-to-background is controlled by mitigating charge-sharing between detectors through careful optimization of a patterned molybdenum absorber mask. A geological application demonstrates the capability of the method to produce high definition elemental images up to ∼100M pixels in size. [Copyright &y& Elsevier]
Published: 2010
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Author: Ryan, C.G., Kirkham, R., Siddons, D.P., Dunn, P.A., Laird, J.S., Kuczewski, A., Moorhead, G., De Geronimo, G., Davey, P., Jensen, M., Paterson, D.J., de Jonge, M.D., Howard, D.L., and Hough, R.M.
Subjects: *NUCLEAR counters, *MICROPROBE analysis, *X-ray spectroscopy, *ACQUISITION of data, *SYNCHROTRON radiation, *SILICON diodes, *TRACE elements
Abstract: Abstract: Application of nuclear microprobe event-by-event data acquisition approaches to synchrotron elemental imaging is at the heart of the design of a large energy-dispersive detector array called Maia, under development by CSIRO and BNL for SXRF elemental imaging on the X-ray microprobe. A new project is aimed at harnessing this development to provide high throughput PIXE imaging on the CSIRO Nuclear Microprobe. Maia combines a 1.2sr solid-angle 384 detector array, integrated scanning and real-time processing including spectral deconvolution of full-spectral data. Results using a Maia prototype demonstrate the potential using SXRF application data with elemental images of up 100M pixels. [Copyright &y& Elsevier]
Published: 2010
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Author: Ryan, C.G., Siddons, D.P., Moorhead, G., Kirkham, R., Dunn, P.A., Dragone, A., and De Geronimo, G.
Subjects: *ENGINEERING instruments, *DETECTORS, *PARALLEL computers, *PARALLEL processing
Abstract: Abstract: A detector concept is described that integrates a large solid-angle detector array developed at Brookhaven National Laboratory and a high speed pipelined parallel processing engine developed at CSIRO for machine vision, with an embedded implementation of the Dynamic Analysis method for fluorescence spectra deconvolution and image projection, to yield a detection system capable of energy-dispersive detection, spectral deconvolution and real-time elemental imaging at ∼108 events per second for PIXE elemental imaging using the nuclear microprobe and SXRF elemental imaging using the synchrotron X-ray microprobe. [Copyright &y& Elsevier]
Published: 2007
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