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Figure 8
(a) XRF raster scanning of the benign sample using incident X-rays of 4.2 keV. The spatial distribution of the Ca Kα fluorescence peak intensity is plotted on a logarithmic scale, and the positions where the XANES spectra have been acquired are marked on the map. The scale bar corresponds to 100 µm. (b) Absorption coefficient at the Ca K edge plotted for three points within the sample, as marked in the XRF plot. (c) WHIT, HAP and calcium carbonate including amorphous (ACC) reference spectra. The carbonate spectra are taken from Xto et al. (2019BB100). (d), (e) Fractions of different species (expressed in percentage) as a function of locations for the lines marked as (e) h and (d) v derived from LCF for all apatite species (tot HAP = HAP + HAP A + HAP B), WHIT, calcite, AC, and the fraction of WHIT in the WHIT and apatite group [WHIT/(WHIT + tot HAP)].

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 1| February 2025| Pages 233-250
https://doi.org/10.1107/S1600576724011750
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