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I'm trying to design a home-built X-ray fluorescence spectrometer with the following layout:

enter image description here

Building the X-ray tube is relatively simple, however I'm uncertain what material could be used as the 'crystal' in this setup?

According to this article, a lithium fluoride crystal could do the trick, but I'm wondering if people here have thoughts on what the optimal setup is.

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You can use whatever single crystal you have. The cheapest high quality single crystals are Si wafers.

Another more DIY-type option might be taking an old GPU or CPU die and grinding it off somewhat until you reach the bulk Si part.

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