Istituto di Geoscienze e Georisorse     
Cossio R., Vaggelli G., Borghi A. Improvements in trace element detection in energy dispersive spectrometry using an X-ray filter (FEDS) and applications to petrological problems. In: Microchimica Acta, vol. 161 pp. 337 - 342. Springer, 2008.
Interaction of electron beam with the surface of a massive sample leads to the emission of characteristic X-rays, which can be collected by an energy-dispersive detector. However, an ED spectrum is marked by a low peak=background ratio, which implies a detection limit around 0.5 wt% for the most common mineral forming elements. In this paper spectra obtained by an EDS microprobe, performed filtering the X-rays striking the detector with a mechanical Al filter (FEDS), are presented. The resultant energy spectrum, processed with an opportune digital filter, allows to reach a detection limit ranging from 100 to tens ppm, depending on the atomic number of the excited element. Therefore, the acquisition of major (by conventional EDS analysis) and trace (by FEDS analysis) elements on the same area (with a resolution of few micrometers) is made possible applying and=or removing the mechanical filter. In this paper the FEDS procedure is described and a comparison among trace elements in certified NIST glass standards and in a metamorphic rock-forming garnet is presented.
URL: http://https://link.springer.com/journal/604
Subject EDS
trace elements
digital filter
spectra processing

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