What type of exposure switch must mobile radiography units be equipped with?

Mobile radiography units must be equipped with a "dead man" type switch to ensure operator safety during the imaging process. This type of switch requires the operator to maintain pressure or action on the switch for the exposure to occur, meaning that if the operator releases the switch for any reason, the exposure will immediately stop. This feature is crucial for preventing unintended exposure to radiation, especially in mobile situations where operators might move or inadvertently remove their hand from the switch.

The design of this safety mechanism is rooted in the recognition that operators may face various hazards while moving equipment, making it essential that they remain in control of the exposure at all times. The dead man switch enhances safety by reducing the risk of accidental exposure to both the patient and the operator, which is a key aspect of radiological safety protocols.