10.26.
Shielded enclosures should be fitted with suitable interlocks on the access doors, to ensure that no one can access an enclosure while an X ray generator is generating radiation. An interlock system should be installed to provide a mechanical or electrical link between the exposure control system and the door or other points of entry to the shielded enclosure. The interlock should prevent the generation of X rays until the door is closed, and it should immediately terminate the production of X rays if the door is opened. Subsequent closing of the door should not automatically re-energize the X ray generator.
10.27.
Door interlocks should not hinder people who may be in the enclosure from leaving in an emergency. Common interlock systems incorporate electrical switches or captive key systems. Interlock systems should be fail-to-safe, so that X rays cannot be generated if any component of the interlock system has failed or is broken. Redundancy, diversity and independence of interlock systems should be used as necessary to provide additional levels of safety.