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All dental X-ray installations shall comply with the requirements of this section:
(1) A diagnostic type protective X-ray tube housing shall be used.
(2) Diaphragms or cones shall be used for restricting the diameter of the useful beam at the end of the cone or at the skin surface to not more than three inches for intraoral radiography, and shall provide the same degree of protection as the tube housing. All machines installed after September 16, 1971 shall be equipped with open end shielded cylinder type cones.
(3) A cone or spacer frame shall provide a target-to-skin distance of not less than seven inches for machines operating above 50 kVp, and not less than four inches for machines operating at 50 kVp or below.
(4) Total filtration, in aluminum equivalents, in the useful beam shall not be less than 0.5 millimeters for machines operating below 50 kVp, not less than 1.5 millimeters for equipment operating at 50 kVp to 70 kVp, and not be less than 2.5 millimeters for equipment operating above 70 kVp. The filter shall be located as near the window of the X-ray tube housing as possible.
(5) The exposure switch shall have a circuit closing contact which can be maintained only by continuous pressure on the switch by the operator.
(6) A device shall be provided to terminate the exposure after a preset time or exposure.
(7) Each installation shall either provide a protective barrier for the operator or be so arranged that the operator can remain at least six feet from the patient during exposure and well away from the useful beam. When a protective barrier is provided, such barrier shall be designed so that operation of the machine is prohibited unless the operator is entirely behind the barrier during an exposure.
(8) Mechanical support of the tube head and pointer cone shall maintain the exposure position without drift or vibration.
(9) Dental rooms containing X-ray machines shall be provided with primary barriers at all areas which potentially intercept the useful beam. [Note: In many cases the structural materials of ordinary walls suffice as a protective barrier without the addition of special shielding material.]
(10) When dental X-ray units are installed in adjacent rooms or areas, protective barriers shall be provided between the rooms or areas.
(11) Deliberate exposure of an individual to the useful beam for training or demonstration purposes shall not be permitted unless there is a diagnostic need for the exposure and the exposure is prescribed by a dentist or physician.
(12) Only a patient shall be in the useful beam; an individual shall not hold film in place for a patient during an exposure.
(13) Neither the tube housing nor the cone shall be handheld during exposure.
(14) Intraoral fluoroscopy shall not be used in dental examinations.
History: Eff. 9/16/71, Register 39
Authority: AS 46.03.020
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Last modified 7/05/2006