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In flight exposure will depend on the route, altitude and aircraft type. However, on average, dose rates received will be in the order of:
Concorde, 12-15 µSv (microsieverts) per hour;
Long haul aircraft, 5 µSv (microsieverts) per hour;
Short haul aircraft, 1-3 µSv (microsieverts) per hour dependent on the altitude reached.
Originally posted by Shadowhawk
In recent years, I have read a few articles about this subject. There have been studies of the levels of cosmic radiation experienced by commercial passenger and cargo arcraft crews and passengers.
I never thought about it until a chance event that occurred while I was flying from Albuquerque to Burbank on Southwest Airlines. We were cruising at about 30,000 feet and I happened to have a ratemeter (Geiger-Mueller counter) with me. When I turned it on to test the batteries, I was surprised to see the needle peg on the lowest scale. It took a moment to recognize the cause.