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After some googling I found a few studies that seem to show an increased risk for pilots as well, particularly skin cancer. I think the increased risk of skin cancer is interesting since that would (layman's speculation) probably be the most affected by radiation.

https://pubmed.ncbi.nlm.nih.gov/12862322/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5559846/

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Normal glass has low transmission for UV-B and UV-C, but significant transmission of UV-A. This in combination with high altitudes (so less atmosphere) and also simple thermal heating, could already explain this.

Perhaps aircraft should add an UV-A blocking layer to their windows?

I don't think increased radiation levels would contribute differentially to skin cancer, because we're talking about gamma rays.

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