Speaker
Description
The full-field X-ray fluorescence (XRF) imaging offers a possibility to create high-resolution 2D elemental maps of a measured sample at once without the need for the sequential scanning of the sample surface with a narrow X-ray beam.
Our setup for full-field XRF imaging utilises low-power X-ray tubes and Color X-ray Camera (CXC) spectrometric pixel detector with a capillary collimator. This technique is less time-consuming in comparison with scanning XRF modality (with comparable spatial resolution), but the original images contain artefacts that need corrections. These artefacts are caused by the uneven irradiation of the analysed area and the variable transmission efficiency of the capillary collimator. The artefact correction and other specifics for geological samples are described and summarized. The studied samples were low-grade uranium-bearing sediments. The parameters of measurements are set specially for the uranium detection, although other elements are also determined to study the domain correlation of the present elements. Although the number of pixels (264 x 264) of the CXC and dimensions of the analysed area (12.6 mm x 12.6 mm) are fixed, the data from several pixels can be added up to get higher X-ray intensities, but at the expense of worse spatial resolution.