This specification applies to dental x-ray protective aprons and accessory devices, such as thyroid collars and thyroid shields used in dentistry that protect the patient, as much as feasible, from the harmful effects of dental diagnostic X-radiation. It specifies the requirements for X-radiation absorption and the areas of anatomy that the aprons and thyroid collars protect.
ANSI/ADA 70-1999 history
1999ANSI/ADA 70-1999 Dental X-Ray Protective Aprons and Accessory Devices