I investigated the idea before jumping in and buying this Horseman 8x10 for this purpose. X-ray blue is a colorblind film like Mathew Brady's, and green is sensitive to blue and green. I've seen the sensitivity graphs and they're pretty flat across that end of the spectrum. There ARE problems as compared to the high-price pan films, but the least of the problems is money. As for me, I simply refuse to pay 70 or 80 dollars for a 10 sheet box of photographic film. Ridiculous. My first idea was to shoot paper negatives, but the x-ray film looks like a better way to go. At least I'll be out there shooting 8x10, as until now, I've been shooting nothing. All things considered, not a bad gig.
Sorry OP for hogging your thread.