PJ, very glad you asked...I tried something out of need and it worked!  Yeah!    My scanner is a goner so thats out.  There is viewing screen at the bird center but I don't have one.

Ok, I took a graphic program which was Paint Shop Pro 8 in this case, opened a "new" blank image and filled it with white. I propped the x-ray on that and shot the image.  Wow! It worked much better than I thought and is actually easier to see here on the post than holding up to a window, etc.

I do have a wide screen monitor and maybe that helped get enough of the film on the white but a standard size will likely do ok if the film is not too large.

So, there you go with a secret revealed.    yo friend,    Tom.