The NBS Linac Master Control and Personnel Protection System

The operation of the NBS linear accelerator and its beam handling equipment has been integrated with personnel and equipment protection safeguards and with the occupancy requirements of the linac complex. A mode switch is used to select beam direction and experimental area, and to program the requirements for personnel protection interlocks, beam handling system conditions, building mechanical services, experimental area services, and linac operation. The system includes visual and audible devices to indicate degree of readiness, hazards, faults, interlock information, zone of operation and emergency situations. A forced inspection of potentially dangerous zones, programmed cued taped warning announcements, key interlocks, and flexibility are built-in features. It offers the capability of providing maximum protection to personnel against environmental radiation hazards, and allows utilization of a maximum of laboratory space for varied beam conditions.