The claim that food exposed to airport X-ray scanners is safe is a well-established physical and regulatory fact (low-dose ionizing radiation passing through luggage does not induce radioactivity or render food unsafe). None of the retrieved papers specifically test or evaluate the consumption safety of food after airport X-ray exposure; they discuss technical aspects of X-ray sources, agricultural CT imaging, medical image perception, medical devices, and port baggage scanner radiation safety regulations generally. Because the claim is a matter of direct everyday and regulatory observation without ongoing scientific contestation, it is classified as COMMON_KNOWLEDGE, with no papers attached.