Gosh I hope by now you have received more info for your dad. (I've just found this site and signed on today) I have to ask if your dad gets regular check ups. Every one of our 'heros' should be doing that especially considering the risk factors of their job. A full body scan is not as specific as those done with an order from a doctor. If he wants information about his lungs then a scan should be ordered for a chest CT. That would provide "slices" that were very close together whereas the full body scan slices are further apart. Obviously things could be missed. The "lowly" chest x-ray is a very good source of information too. If you talk to the radiology folks you will probably find that most object to the full body scan idea....unnecessary radiation exposure....risk versus benefits.