The gonadal/fetal dose incurred with two periapical dental films (when a lead apron is used)is __________ that for 1 day of average exposure to natural background radiation in the United States.

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It is 700 times less than that for 1 day of average exposure to natural background radiation in the United States.Despite the negligible risks of dental radiography,radiographs should be obtained selectively and only when necessary and appropriate to aid in diagnosis and treatment.To further reduce the radiation dose,the following measures should be employed: rectangular collimation,E-speed or F-speed film or faster techniques,lead shielding,high-kilovoltage (kV)or constant beams,and an ongoing quality-assurance program for equipment and technique.

The Gonadal/fetal Dose Incurred with Two Periapical Dental Films (When