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Figure 2
Top: sensitivities, lower limits of detection (inset table) and sum spectra (inset; in blue for the loaded, gray for the blank filter) of 36 (6 × 6) pixels measured on the NIST Standard Reference Material (SRM) 2783 (Air Particulate on Filter Media) with 17 keV monochromatic excitation. Note that the error bars on the sensitivity values are most likely underestimated due to the small size of the measured area. Bottom: distribution maps for four selected elements (Ca, Fe, Cr and Zn) showing the inhomogeneity of the SRM. The distance between pixels was 10 µm. The measurement time per pixel was 120 s.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 4| July 2018| Pages 1189-1195
https://doi.org/10.1107/S1600577518006203
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