Maia X-ray fluorescence imaging: Capturing detail in complex natural samples

22nd International Congress on X-Ray Optics and Microanalysis

Ryan, C.G.^1 ; Siddons, D.P.^2 ; Kirkham, R.^3 ; Li, Z.Y.^2 ; De Jonge, M.D.^4 ; Paterson, D.J.^4 ; Kuczewski, A.^2 ; Howard, D.L.^4 ; Dunn, P.A.^3 ; Falkenberg, G.^5 ; Boesenberg, U.^5 ; De Geronimo, G.^2 ; Fisher, L.A.^1 ; Halfpenny, A.^1 ; Lintern, M.J.^1 ; Lombi, E.^6 ; Dyl, K.A.^7 ; Jensen, M.^3 ; Moorhead, G.F.^3 ; Cleverley, J.S.^1 ; Hough, R.M.^1 ; Godel, B.^1 ; Barnes, S.J.^1 ; James, S.A.^4 ; Spiers, K.M.^4 ; Alfeld, M.^5 ; Wellenreuther, G.^8 ; Vukmanovic, Z.^1,7 ; Borg, S.^1

CSIRO Earth Sciences and Resource Engineering, 26 Dick Perry Avenue, Kensington, WA 6151, Australia^1

Brookhaven National Laboratory, Brookhaven, Upton NY, United States^2

CSIRO Materials Science and Engineering, Normanby Road, Clayton VIC 3168, Australia^3

Australian Synchrotron, Blackburn Road, Clayton VIC 3168, Australia^4

Photon Science, DESY, Notkestr. 85, D-22603 Hamburg, Germany^5

Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes Campus, Mawson Lakes SA 5095, Australia^6

Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia^7

European XFEL, Albert-Einstein-Ring 19, 22761 Hamburg, Germany^8

关键词: Fluorescence tomography;    Hardware and software;    High definition imaging;    Parallel processing;    Real time processors;    Spectral deconvolution;    X-ray fluorescence imaging;    X-ray fluorescence microscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/499/1/012002/pdf
DOI  :  10.1088/1742-6596/499/1/012002

来源: IOP

【 摘 要 】

Motivated by the challenge of capturing complex hierarchical chemical detail in natural material from a wide range of applications, the Maia detector array and integrated realtime processor have been developed to acquire X-ray fluorescence images using X-ray Fluorescence Microscopy (XFM). Maia has been deployed initially at the XFM beamline at the Australian Synchrotron and more recently, demonstrating improvements in energy resolution, at the P06 beamline at Petra III in Germany. Maia captures fine detail in element images beyond 100 M pixels. It combines a large solid-angle annular energy-dispersive 384 detector array, stage encoder and flux counter inputs and dedicated FPGA-based real-time event processor with embedded spectral deconvolution. This enables high definition imaging and enhanced trace element sensitivity to capture complex trace element textures and place them in a detailed spatial context. Maia hardware and software methods provide per pixel correction for dwell, beam flux variation, dead-time and pileup, as well as off-line parallel processing for enhanced throughput. Methods have been developed for real-time display of deconvoluted SXRF element images, depth mapping of rare particles and the acquisition of 3D datasets for fluorescence tomography and XANES imaging using a spectral deconvolution method that tracks beam energy variation.