Was it a makeshift container?
Size?
Was it like a toolbox?
Homemade?
Pooper can answer all construction queries
If it indeed was a portable piece of field testing x-ray equipment, it would have looked something like this:
http://www.goldenengineering.com/home.HTM
It would most likely have been in a shielded case due to it's very nature.
Piper,
Sorry, I'm not aware that any details were given. It's maddening!