Diagnosis: X-Ray Excess

Up to 75 million people in the U.S. are exposed each year to diagnostic medical X rays; 50 million have dental X rays; 8,000,000 are fluoroscoped. According to Karl Z. Morgan, health physicist on the 1943 Manhattan Project and now at Oak Ridge National Laboratory, many of the millions are probably being dangerously overexposed to radiation. Before the Senate Commerce Committee last week, Dr. Morgan admitted that statistics on radiation hazards are guesses at best—but he suggested that anywhere from 3,500 to 30,000 U.S. deaths may result each year from the cumulative effects of radiation.

Man-made radiation (now equal to...

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