Radiological Training for Accelerator Facilities
Passive engineered controls
Once installed, passive engineered controls require no further action to perform their
intended function. Passive engineered controls may include:
Radiation shielding such as concrete blocks, iron plates, lead bricks and earth berms;
Barriers such as fences, locked gates, and doors.
Active engineered controls
Active engineered controls include devices that sense changing conditions and can trigger
a safety action. Personnel are prevented from accessing beamline areas when the
accelerator is operated. All access points are protected by doors or gates that are both
locked and interlocked. The interlock sensors will turn off the beam in the event a door
Safety interlock devices include:
Area radiation monitors.
Access gate sensors.
"Crash" or "scram" buttons.
Administrative controls include programs and procedures that personnel must implement to
provide protection from hazards.