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Figure 2
Top: optical micrograph (top left), X-ray differential phase contrast (DPC, top right) and XRF (1.5 µm resolution) elemental distribution maps for a 100 µm-thick section of a human tooth filled with amalgam for >20 years. The site of the filling is on the left side of the tooth. The scan region (75 µm × 75 µm) for the DPC and XRF images is indicated by the black arrow in the optical micrograph. The scale bar only applies to the XRF and DPC images; the scale for the optical micrograph is similar to that of Fig. 1[link]. Maxima for each element in mg g−1 (assuming a tooth density of 2.1 g cm−3) are given below the element symbol. The red box and red arrow indicate the location of finer scans displayed in Figs. 3[link] and 4[link]. Points 1 and 2 indicate the location for XANES spectra shown at the bottom of the figure. Bottom: Hg LIII-edge XANES spectra from 0.25 µm × 0.25 µm spots as indicated in the Hg map. The trace in green corresponds to residual amalgam (point 1) while the red trace corresponds to the Hg present in tubules (point 2).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 15| Part 2| February 2008| Pages 123-128
doi:10.1107/S0909049507061468
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