Final answer:
The question concerns the protocols for managing communication frequencies during flight to avoid interference, as well as special considerations for passengers who have undergone specific medical procedures that may trigger radiation detectors at airports.
Step-by-step explanation:
The question relates to the protocol for aviation communication systems and their potential interference with other equipment. In aviation, communication with the control center during flight is critical for maintaining safety and coordination.
This communication must be reliable and free from external interference, which is why the usage of personal devices like mobile phones is often restricted on flights. Mobile phones operate at 1.9 GHz, which is close to the frequencies used by aviation communication systems, and can potentially disrupt these communications if not controlled.
The constraint that communication with the control center during flight cannot exceed 15 minutes may also relate to operational protocols or specific regulations designed to minimize the chances of such interference, though it's more commonly applicable to post-medical procedures involving radioactive tracers, rather than regular flights.
Travelers who have undergone certain medical procedures that involve radioactive isotopes might trigger radiation detectors at airports due to the short-term presence of these isotopes in their body.
This matter illustrates the complexity of managing different systems and frequencies within the same environment to ensure safety and functionality. For passengers undergoing certain medical treatments, special permission is often required to fly on commercial flights to prevent false alarms and manage the risk associated with their temporary radioactivity.