Here you have +4000 posts about xray film: http://www.largeformatphotography.in...highlight=xray
Regarding tonality, a common situation is that x-ray is very green sensitive, way less blue sensitive and not red sensitive. In general special development has to be made to lower the contrast.
You can obtain similar tonality with proper filtering and common pictorial film, or taking a DSLR color image, zeroing red channel and lowering blue a lot.
We can consider x-ray film a defective pictorial film, but an artist can take advantage of those shortcomings in the creative way to obtain awesome results.
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