NAC459.608. X-ray and electron therapy installations: Shielding requirements.

Shielding must be adequate to meet the requirements of NAC 459.320 to 459.374, inclusive. In addition, each of the following design requirements apply:

     1. Except for entrance doors, all the required barriers must be fixed barriers.

     2. The control panel must be located outside the treatment room or within a protective booth equipped with an interlocked door which is electrically connected to the control panel so that the door must be closed during radiation production.

     3. Windows, mirror systems, closed-circuit television viewing screens or other equivalent viewing systems must be provided to permit continuous observation of the patient during irradiation and must be located so that the operator may see the patient and the control panel from the same position. When the viewing system is by electronic means, for example, television, an alternate viewing system must be provided for use in any failure of the primary system.

     4. Provisions must be made for two-way aural communication with the patient from the control station.

     5. Treatment rooms to which access is possible through more than one entrance must be provided with warning lights in a readily observable position near the outside of all access doors which will indicate when the useful beam is on.

     6. Interlocks must be provided so that all entrance doors must be closed before treatment can be initiated or continued. If the radiation beam is interrupted by any door opening, it must be possible to restore the machine to operation only by closing the door and subsequently reinitiating exposure by manual action at the control panel.

     [Bd. of Health, Radiation Control Reg. §§ 6.9.2-6.9.2.6, eff. 2-28-80]—(NAC A 1-18-94)