Which statement about the dead man type exposure switch is true?

A dead man type exposure switch is designed with safety as a primary concern in the context of fluoroscopic procedures. The correct answer highlights that the switch terminates exposure when pressure is released and operates with circuit closing contact maintained by pressure. This design ensures that the operator maintains control over the exposure, effectively reducing the risk of accidental radiation exposure to patients or personnel.

When the operator applies pressure to the switch, the exposure is initiated, and as long as pressure is maintained, the circuit remains closed, allowing the exposure to continue. If the operator releases the pressure, the circuit opens, thereby terminating the exposure immediately. This feature is crucial for ensuring that the exposure does not continue unintentionally, providing a critical safety mechanism in fluoroscopy operations.

The option stating that it only operates when the operator dies is misleading and not representative of the switch's purpose; its design is focused on preventing accidents by ensuring that exposure can be promptly stopped if the operator is incapacitated or has to release the switch for any reason.