A licensee shall control access to the teletherapy room by a door at each entrance.
A licensee shall equip each entrance to the teletherapy room with an electrical interlock system that shall:
1. Prevent the operator from turning on the primary beam of radiation unless each treatment room entrance door is closed;
2. Turn off the beam of radiation immediately when an entrance door is opened; and
3. Prevent the primary beam of radiation from being turned on following an interlock interruption until all treatment room entrance doors are closed and the beam on-off control is reset at the console.
A licensee shall equip each entrance to the teletherapy room with a conspicuously visible beam condition indicator light.