Full Description ADOPTED_FROM:EN 16424:2014 This Technical Specification is dedicated to field portable X-ray fluorescence (XRF) equipment (hand-held or portable bench top) and describes a screening method for the determination of the elemental composition of waste materials for on-site verification. Portable XRF spectrometers are used for a rapid and exploratory analysis of liquid, paste-like or solid materials. The absence or presence of specific elements is displayed qualitatively in terms of negatives and positives with an indication of the concentration level.