eli5 why does riding in an airplane cause radiation exposure? Does the airplane itself not block it?

Question

eli5 why does riding in an airplane cause radiation exposure? Does the airplane itself not block it?

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Answer 1

There was something published (probably a couple of decades ago), calculating the lifetime radiation exposure of a airplane pilot vs. other professions. It was of course higher, but higher by some minuscule number, equivalent to a couple of dental x-rays.