There are machines [1] designed for this sort of thing, my father used to "own" a JEOL one that he used for research on all kinds of stuff from Iron Age artifac

There are machines [1] designed for this sort of thing, my father used to "own" a JEOL one that he used for research on all kinds of stuff from Iron Age artifacts to gas turbine blades. [1] https://en.wikipedia.org/wiki/Electron_microprobe https://en.wikipedia.org/wiki/Electron_microprobe