Double Dispersive X-Ray Fluorescence (D 2 XRF) based on an Energy Dispersive pnCCD detector for the detection of platinum in gold

With the aim of improving limits of detection (LOD) of trace elements in a matrix with adjacent fluorescence energies, a simple double dispersive X-ray fluorescence detection system (D2XRF) was constructed to operate at the beamlines BAMline and the mySpot @ BESSY II. This system is based on the combination of a crystal analyzer with an energy resolving single photon counting pnCCD. Without further collimators, the efficient suppression of the background by the pnCCD and the good energy resolution of the crystal results in improved LOD. In first order reflections, an energy resolution of 13eV for Cu Kα was reached, and an energy range of 1keV was covered in one shot.