Which combination of features is required for mobile X-ray exposure switches?

• A. 2 and 3
• B. 1 and 2
• C. 1, 2, and 3
• D. 1 and 3

Answer: (B)

Mobile X-ray exposure control must be safe and deliberate. The essential requirement is that exposure only occurs when the operator actively and continuously presses a remote switch, and that releasing the switch immediately ends the exposure. This dead-man, momentary-action design prevents accidental energizing of the tube and ensures the operator maintains control throughout the exposure, which is crucial for patient and staff safety.

Pairing that active, continuous press capability with a remote control that allows the operator to stand at a safe distance from the patient and tube provides the control safety needed in mobile radiography. If a combination relies on any additional feature that isn’t required for safe operation (such as extra indicators or secondary interlocks), it isn’t necessary for meeting the fundamental safety requirement, so the two core features are the ones that must be present.

In short, the best combination includes the active, continuous-press control plus the remote operation capability, ensuring deliberate, stoppable exposure from a safe distance.