Spectral analysis of chemical content of metals and alloys in US

Dear colleagues,

I found very little information about implementation of spectral analysis of chemical content of metals and alloys (X-rays and optical emission spectrometers) in US. It seems not widely spread here. What are the perspectives of this method? Is there any information about what part of the market it holds. Do I need to have any certification to perform this method? I would be really grateful if you share the ideas where to search these data.

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