Radiation has been a great boon to medicine, helping doctors reveal hidden problems, including broken bones, lung lesions, heart defects and tumors. It can be used to treat and sometimes cure certain cancers.
Now researchers are pointing to its potentially serious side effects: the ability to damage DNA and, 10 to 20 years later, to cause cancer. CT scans alone, which deliver 100 to 500 times the radiation associated with an ordinary X-ray and now provide three-fourths of Americans’ radiation exposure, are believed to account for 1.5 percent of all cancers that occur in the United States.
Numerous experts, including some radiologists, are now calling for more careful consideration before ordering tests that involve radiation.