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Elemental X-ray imaging using the Maia detector array: The benefits and challenges of large solid-angle

2009; Elsevier BV; Volume: 619; Issue: 1-3 Linguagem: Inglês

10.1016/j.nima.2009.11.035

1872-9576

C.G. Ryan, R. Kirkham, R. M. Hough, G. F. Moorhead, D. P. Siddons, Martin D. de Jonge, David Paterson, G. De Geronimo, Daryl L. Howard, James S. Cleverley,

Nuclear Physics and Applications

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 ∼100 M pixels in size.