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High-Speed PIXE: Large area irradiation effects
Buchriegler, J.; Hanf, D.; Merchel, S.; Munnik, F.; Nowak, S. H.; Renno, A. D.; Scharf, O.; von Borany, J.; Ziegenrücker, R.
The so-called “High-Speed PIXE” is a novel combination of the SLcam® [1,2] and PIXE. The pixel-detector comprising 264 x 264 pixels in combination with a polycapillary 1:1 X-ray optics allows a fast detection of elements over a field of 12 x 12 mm² simultaneously with a lateral resolution below 100 μm.
In order to approach the final goal of quantitative analysis of geological samples, a homogeneous proton irradiation is essential. This can be realised by scanning a finefocused beam electrostatically across the area of interest which also minimises the required over-scan area.
However, the corresponding high proton density favours pile-up effects. In contrast to a classical micro-beam PIXE set-up, charge is collected in all pixels simultaneously for 1 ms. To enable trace element analysis, pile-up effects have to be suppressed calling for lower current densities.
 O. Scharf et al., Anal. Chem., Vol. 83, pp. 2532-2538 (2011).
 I. Ordavo et al., NIM A, Vol. 654, pp. 250-257 (2011).
14th International Conference on Particle Induced X-ray Emission (PIXE 2015), 26.02.-03.03.2015, Somerset West, South Africa