Entire aircraft engines and rocket engines can in fact be x-rayed (google image search awaits you). Granted if you stuck your hand in there it would definitely

Entire aircraft engines and rocket engines can in fact be x-rayed (google image search awaits you). Granted if you stuck your hand in there it would definitely get cooked. The power levels are much higher. If you really want to dive down a rabbit hole, look up how they image welds on pipelines... literally inject radioactive gas between two cardboard/clay plugs and tape an xray film on the outside of the weld for an hour or two.