Interestingly, due to the altitude it flew at Concorde included a radiation detector that triggered a cockpit warning light when the incident ionizing radiation

Interestingly, due to the altitude it flew at Concorde included a radiation detector that triggered a cockpit warning light when the incident ionizing radiation exceeded a preset limit. The standard operating procedure if the warning was triggered was to descend to a lower altitude. (Presumably this was more about the aircrew's cumulative dose than the passengers).