All open-beam systems must have an indication that the:
- (1) x-ray tube is "ON" or "OFF" located near the radiation source housing if the primary beam is controlled in this manner; and/or
- (2) shutter is "OPEN" or "CLOSED" located near each port on the radiation source housing if the primary beam is controlled in this manner.
Added at 17 Ok Reg 1136, eff 6-1-00