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![[Figure 5]](il5039fig5mag.jpg)
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Figure 5
Characterization of Si, S, Y and U in a rock section. An incident-beam energy of 3555 eV optimizes U Mα fluorescence (at the M5 edge), stimulates Y Lα fluorescence (the L3 edge is 2080 eV), as well as K fluorescences from S, Si and Al (K-edges 2480, 1840 and 1560 eV), but remains below the major-element Ca K-edge (4040 eV). (a) XRF image of Y [L(α,β) fluorescence at 1994 and 1998 eV] in red, Si (Kα at 1740 eV) in green and U (Mα at 3164 eV) in blue. The beam size is 10 µm × 5 µm, the pixel size is 25 µm and the flux is ∼1010 photons s−1. Different minerals present include calcite CaCO3, appearing mostly black; fluorite CaF2 with locally variable trace U content, appearing patterned blue; Al–Si clay minerals, appearing greenish or blue-green if U is present; and a carbonate of Y, appearing red. (b) A high-resolution XRF image of Y in red, S (Kα at 2310 eV) in green and U in blue, of the small area indicated. The beam size is ∼2 µm, the pixel size is 1.5 µm and the flux is ∼109 photons s−1. Sample provided by E. Rasbury (Piccione et al., 2019  ). |
![[Figure 5]](il5039fig5.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
