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In any procedure the danger increases with old-fashioned-X-ray machines and inexperienced operators. The sensible conclusion is that patients would be foolish to forgo needed X rays, especially when given by a doctor or dentist who knows his business and his dosages, and would be still more foolish to expose themselves to needless X rays.
* A unit of measurement named for the discoverer of X rays, Wilhelm Konrad Roentgen (1845-1923).