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This goes beyond the medical field. ProPublica did a story about how X-rays are becoming more common in law-enforcement and border security as well.

THAT is what scares the willys outta me. Because we've all seen how far those types of agencies will take these types of "security measures".

Is there a relatively inexpensive portable Geiger counter or something that can measure this type of radiation?

Or you could just get an app (and some black tape), depending on the energy range you want to look at:

edit: I think I got the wrong thing there.. better go for this: