NAC459.660. Area requirements.

     1. The local components of an analytical X-ray system must be so located and arranged to include sufficient shielding or access control so that no radiation levels exist in any area surrounding the local component group which could result in a dose to a person present therein in excess of the dose limits given in NAC 459.335. For systems utilizing X-ray tubes, these levels must be met at any specified tube rating.

     2. Radiation surveys, as required by NAC 459.337, of all analytical X-ray systems sufficient to show compliance with subsection 1 must be performed:

     (a) Upon installation of the equipment and at least every 12 months thereafter;

     (b) Following any change in the initial arrangement, number or type of local components in the system;

     (c) Following any maintenance requiring the disassembly or removal of a local component in the system;

     (d) During the performance of maintenance and alignment procedures if the procedures require the presence of a primary X-ray beam when any local component in the system is disassembled or removed;

     (e) Any time a visual inspection of the local components in the system reveals an abnormal condition; and

     (f) Whenever personnel monitoring devices show a significant increase over the previous monitoring period or when the readings are approaching the radiation dose limits specified in NAC 459.320 to 459.374, inclusive.

     3. Radiation survey measurements are not required if a registrant or licensee can demonstrate compliance with subsection 1 to the satisfaction of the Division in some other manner.

     4. Each area or room containing analytical X-ray equipment must be conspicuously posted with a sign or signs bearing the radiation caution symbol and the words “CAUTION - X-RAY EQUIPMENT,” or words having a similar intent.

     [Bd. of Health, Radiation Control Reg. §§ 8.4-8.4.3, eff. 2-28-80]—(NAC A 1-18-94)