X-ray fluorescence spectroscopy (XRF) is an analytical technique used to determine the chemical composition of solids, liquids and powders. X-rays are used to excite the sample which subsequently emits specific X-ray fluorescence. It can be used to obtain a qualitative screening of the analysed materials or after calibration to obtain a quantitative chemical composition. It is a non-destructive technique and for most samples sample preparation is hardly required.
XRF can be divided in two main categories depending on the detection method, ie wavelength (WD) or energy (ED) dispersive systems. OCAS has an ED-XRF system and a complementary WD-XRF is currently being installed.