How fun! I have used x-ray film...but not in Dektol, which I have used to gain contrast with FP4+. Now I use Ilford's Universal PQ Developer instead...but no x-ray film. The loss of sharpness of having emulsion on both sides when making carbon prints (relatively thick 'emulsion') was not acceptable for my work.
The images below were taken with x-ray film and processed at the hospital (the techs loved it!) Taken in open shade at ASA800 (I took one at ASA400, but it was a little thin. ASA 800 was a good exposure. Using the same film under the redwoods, the ASA dropped down closer to 100 (but developed by me). I believe it to be the same film you are using. The color of the light source seems to be a big deal with x-ray film!
[Edit -- I got it backwards...I did used the ASA 800 negs for printing -- the ones at ASA400 were too dense (but still printable). Thanks Don!]
Bryce, Calder, Alex
8x10 platinum/palladium prints
PS - I had no idea Calder had such freckles until this image. Calder's shirt and pants, and Bryce's pants were red -- thus almost clear in the negative.