Abstract This paper introduces an ultra-fast x-ray fluorescence (XRF) spectrometer based on a novel ring-shaped Semiconductor Drift Detector (SDD) and on a novel readout and processing electronics and discusses its performance. The new detector is based on 4 independent droplet type SDDs monolithically integrated on the same chip. The detector shape optimizes the collection angle of the fluorescence radiation. The x-ray excitation beam is focused on the sample by means of a polycapillary lens through the hole cut in the center of the detector. The droplet type SDD is characterized by a better energy resolution and a better peak-to-valley ratio with respect to the ones of conventional SDDs. The energy resolution is of the order of 140 eV FWHM on the Mn K line with 1 s shaping time at -15°C and the peak-to-valley ratio is of the order of 6000. In order to fully exploit the detection rate performance of this detector we have developed a novel read-out electronic unit with selectable shaping time and on-board histogramming capability.

Performance Evaluation of an Advanced XRF Elemental Mapping System Featuring a Novel Ring-Shaped Monolithic Array of Silicon Drift Detectors

ALBERTI, ROBERTO;BUZZETTI, SIRO;FIORINI, CARLO ETTORE;GUAZZONI, CHIARA;KLATKA, TOMASZ;LONGONI, ANTONIO FRANCESCO;
2007

Abstract

Abstract This paper introduces an ultra-fast x-ray fluorescence (XRF) spectrometer based on a novel ring-shaped Semiconductor Drift Detector (SDD) and on a novel readout and processing electronics and discusses its performance. The new detector is based on 4 independent droplet type SDDs monolithically integrated on the same chip. The detector shape optimizes the collection angle of the fluorescence radiation. The x-ray excitation beam is focused on the sample by means of a polycapillary lens through the hole cut in the center of the detector. The droplet type SDD is characterized by a better energy resolution and a better peak-to-valley ratio with respect to the ones of conventional SDDs. The energy resolution is of the order of 140 eV FWHM on the Mn K line with 1 s shaping time at -15°C and the peak-to-valley ratio is of the order of 6000. In order to fully exploit the detection rate performance of this detector we have developed a novel read-out electronic unit with selectable shaping time and on-board histogramming capability.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/552417
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