Macro-X-ray Fluorescence Imaging For Objects of Three-dimensional Shape
Yousef Yousef Ali Yousef Ali Alsaad (TU Delft - Mechanical Engineering)
M.W.E.M. Alfeld – Mentor (TU Delft - Team Matthias Alfeld)
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Abstract
“Macro X-ray fluorescence (MA-XRF) is widely used for investigations in cultural heritage, yet measurements of curved objects remain prone to geometric artefacts. This thesis investigates the effects of working distance and surface tilt on MA-XRF imaging and evaluates different scan strategies of a curved object. A custom instrument was assembled using motorised linear stages to scan a cylindrical-shaped decorative mug using four modes: 2D, 2D with a fixed offset, 3D utilising three degrees of freedom, and 3D using a rotating stage and one motorised stage. Processing and fitting of data produced spectral and elemental maps, allowing for the qualitative comparison of the scanning modes. Scans of the same areas differed in spectral fidelity and count behaviour, showcasing the influence of detection geometry on the MAXRF acquisitions. Overall, scans adhering to the object curvature have substantially improved spatial fidelity and signal robustness in the imaging, showcasing the practicality of the solution.”