In my search, I found that they spend almost an equal number of hours in air like you said - 75-100 hours per month. If that's the case, after adjusting for sex, these numbers holding would throw some uncertainty into the radiation hypothesis.

The fuselage probably has a lot less attention to shielding even if the cockpit seems very exposed.

This is peak HN. Two engineers running google searches without any primary sources speaking up about the issue.

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