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Suppose the dose rate in an airplane is 10 times higher than
on the earth surface; this is probably an exaggeration (?). In
that case a pilot flying 24 hrs and 7 days per week would get
~200*10=2000 mR = 2 R per year. What fraction of the year
is a typical pilot flying? I am sure it is well below 10%.
Therefore, my inclination is to think that the additional
dose due to flying is not excessive. But this is only a
Fermi-like guess. Are my assumptions wrong?
Ludwik Kowalski