What interpretation would one give to the elemental overlap in an EDS spectrum?

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Vladimir Dusevich

If for two elements difference in energies of some X-ray emission transitions is less than (roughly) width of their lines, then we can see overlapping.

Gerhard Martens

Natural peak widths are very small compared the energy resolution of the detector. Thus overlap of peaks is mainly an experimental/instrumental issue.

See for example:

http://indico.ictp.it/event/a13226/session/3/contribution/58/material/slides/0.pdf