Makes you wonder, if/how _passengers_ are directly protected against the radiation
They're not. Excessive high altitude flight increases your chance of developing melanoma.
https://pmc.ncbi.nlm.nih.gov/articles/PMC9447865/
Passengers flying now and then, it's not a big deal, but aircrews are at increased risk of cancer.
They're not. Excessive high altitude flight increases your chance of developing melanoma.
https://pmc.ncbi.nlm.nih.gov/articles/PMC9447865/