No amount of ionizing radiation, however small, should be considered inconsequential to the patient, to the physician and others engaged in radiologic work, or to their posterity. Young persons especially should be protected against needless exposure. Fluoroscopy involves considerable exposure. This can be reduced by a number of precautions here described. Fluoroscopy should not be allowed to become routine, and when it is necessary it should be preceded by a study of roentgenograms so that the fluoroscopist can concentrate his examination on specific areas and reduce the exposure.
Corday E, Jaffe H. ROUTINE CARDIAC FLUOROSCOPY—AN UNNECESSARY HEALTH HAZARD. JAMA. 1960;172(11):1127-1130. doi:10.1001/jama.1960.03020110011003