EXONERATING X RAYS
Does exposure to medical X rays cause cancer, in particular leukemia, a form of the disease long known to be linked with radiation? Doctors have never been able to give a conclusive answer because they lacked records showing how much radiation patients had received. Last week researchers at the Mayo Clinic in Rochester, Minn., said that they have finally overcome this difficulty. Turning to the centralized medical records of Minnesota's Olmsted County, they compared the X-ray dosages of 138 people who developed leukemia between the years 1955 and 1974 and those of 276 other people who had received about...
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