How does radiation exposure compare between a person flying at cruising altitude versus someone on the ground at sea level?

Answer

The flyer receives a substantially higher dose rate, sometimes comparable to LEO exposure.

The protection offered by the atmosphere is not uniform; passengers at cruising altitude receive a dose rate significantly higher than those on the ground, sometimes approaching levels seen in Low Earth Orbit.

How does radiation exposure compare between a person flying at cruising altitude versus someone on the ground at sea level?
Rayradiationcosmicdangerlethality