Which factors amplify galactic cosmic radiation exposure during flight?

• A. Altitude and flight duration.
• B. Cabin pressure and humidity.
• C. Temperature and wind.
• D. Time of day and oxygen level.

Answer: (A)

Galactic cosmic radiation exposure increases with altitude because the atmosphere acts as a shielding layer. The higher the aircraft, the thinner the atmosphere above it, so more high-energy particles reach the flight level. Exposure also accumulates over time, so longer flights give you more cumulative dose. Cabin pressure and humidity, while important for comfort and safety, don’t significantly change the amount of radiation penetrating to cruising altitudes. Temperature, wind, time of day, and oxygen level likewise have little to no impact on cosmic radiation exposure during standard flight.