Figure 2
From: 3D chemical imaging in the laboratory by hyperspectral X-ray computed tomography
Pd metal distribution on a porous alumina catalyst body.
(a) Typical voxel spectrum from the sample showing a distinct step-change in attenuation at 24.3 keV, corresponding to the Pd K-edge. (b) Spectral fitting to the absorption spectrum. Two linear functions are least squares fitted above and below the edge. These are evaluated at the known edge position and subtracted to obtain Δμ0. By repeating this process for every voxel spectrum, the relative Pd metal concentration can be visualised in 3D. (c) and (d) Vertical and horizontal orthoslices of Δμ0. (e) 3D exterior visualisation of Δμ0.
