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x-ray comparisons

There are many websites which comparisons are made between dental x-rays and other things. There are huge inconsistencies between these comparisons. This is presumably to enhance the public perception of dental x-rays. But do this comparisons make any sense? Almost all comparisons are made with an event that takes much longer than taking of an x-ray. My best guess (using Google) is that exposure to radiation from a dental x-ray is between a fraction of a second and ten seconds. For example, is there are a difference between being exposed to the same amount of radiation in ten seconds, as receiving it over a year? The effect on the body may well be different. One website compared a dental x-ray with 6 months of background radiation. Here are some comparisons with other things. Taking 30 Aspirins in 30 minutes is equal to taking one Aspirin a day for 30 days. Drinking one drop of concentrated nicotine equal to the nicotine in one packet to the  is equal to smoking a pa