How to absorb a characteristic line in the spectrum

[bznm]

I have an x-ray tube. When I see the spectrum, I notice the characteristic lines of the anode. What do I have to do if I want to absorb a characteristic line?

I have thought that I can add a filter. But.. which filter? Should it be an element such that the bound energy for the K-shell electrons is minor of the energy of the characteristic line that I want to absorb?

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In this specific case:
I have an x-rays tube with a anod in molybdenum. In the spectrum, I see the caracteristic lines k_alpha=63 pm and k_beta=71 pm.

I want to filter the k_alpha line much more than the k_beta line.

Which filter do I have to use?

Zr, E_k=18 kev

Nb, E_k=18.99 kev

Mo, E_k=20 kev

According to what I previously said, I'd choose Zr and Nb. Do you agree with me?

Thanks a lot!

 

[Simon Bridge]

I have an x-ray tube. When I see the spectrum, I notice the characteristic lines of the anode. What do I have to do if I want to absorb a characteristic line?

This is an emission line we are talking about, and you don't want it in the spectrum?
Then why not take a background spectrum and subtract it from the final data spectrum.

Or do you want to preferentially detect that line?