Characterization of ED-XRF technology applied to wooden matrix

The Energy Dispersive X-ray (ED-XRF) Fluorescence is an analyticals technique fordetection and quantification of heavy metals, widely used in portable devices basically conceivedfor metallic alloys. Preliminary tests are needed to use the instrument on different matrices likewood. In this work minimum detection limit (MDL), signal to noise ratio (SNR), repeatability,relationship between measurement time and elements detected, depth of measurement, set-up(background, operator ergonomics and operator X-ray adsorbed dose) have been investigated ortested. MDL varies with time ranging from few thousands (e.g. Cl) to few units (e.g. As) of mg.kg-1.Repeatability error is 5-6 %. Average SNR ranges from 5 to 31 in function of measurementtime. The measurement time influences detection of elements. Measurement depth ranges from15 to 24 mm according to wood density and anatomy. Best backgrounds are air and shield cap.Best set-up is inside X-ray protection cabinet. Radiation leakages have been found in bench topoperations. Effectiveness of technique has been proven, with limitations, in multielement analysisof wood-based products.