Since they were discovered in 1895, x-rays have been used for many different purposes. My first experience with x-rays was at a large department store in Cleveland about 1950. A device called a shoe-fitting fluoroscope enabled me, a clerk and my parents to see whether I needed a new pair of shoes. It used x-rays, a continuous stream of them, to see my feet through my shoes as long as a button was pushed. It seems as though I was one of the lucky ones who had used it, at least this far. I guess I didn’t play with it as much as some other children did. A number of them received radiation burns from overexposure. However, anyone within about 10 feet of the device was at risk when it was used.
Since that time, I have been given chest x-rays in school to look for tuberculosis; the dentist used them for checkups and I had x-rays when I was hospitalized after an accident. Back then, no one knew enough to be concerned even though early x-ray machines used higher doses of radiation than newer ones. Now when x-rays are taken, doses are not only lower, but lead aprons are also used in an attempt to reduce collateral damage. Also, technicians stay behind the scenes in shielded rooms. Nevertheless, exposures continue to grow as CT scans have become more popular than simple x-rays. Each CT scan is typically equivalent to several hundred x-rays. When you consider that it sometimes takes multiple scans to get a good one, and specialists may want to have ones from different angles, radiation can really add up.
Since it typically takes time for cancer to develop, it is difficult to predict the impact of these exposures. Couple this with cell phones, high tension power lines, airport scanners, microwave ovens, and a growing amount of other electromagnetic radiation, and the outlook for risk does not look good. My recommendation is to keep a log that itemizes scans and other exposures. If possible, try to obtain an estimate of the incremental exposure from each one of them. Then, put the results in a Lifelong Personal Health Record and share concerns with providers before getting additional scans. Although CT scans certainly help to diagnose problems, minimizing exposure to any type of radiation is a good idea especially when there is so much that we do not know about their danger.