Fig. 18
From: Recent progress in instrumental techniques for architectural heritage materials
a The black line in the photograph indicated the profile where the synchrotron radiation was taken; b Selection of the SR-µ-XRF spectra on Bray sandstone taken along a line perpendicular to the sandstone surface (7200 eV, beam size 16 µm, 100 s measuring time, the labels show the position of the Kα fluorescent emission line, except the Ba-Lα line) [241], copyright (2009) Elsevier