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What is An airline flight of 5 hours in the middle latitudes at an altitude of 12 km may result in an exposure of _____  µSv. and explain in detail?
Directly picked from White and Pharoah:
"An airline flight of 5 hours in the middle latitudes at an altitude of 12 km may result in an exposure of about 25 µSv".
White and Pharoah's Oral  Radiology Principles and Interpretation 8th edition