Originally Posted by astroflyer

Not to take this on a tangent, but I think this is partly correct and partly incorrect. Yes, if the solar weather is severe, they will adjust or curtail polar routes (the magnetic fields near the poles provide much less protection from cosmic rays than near the equator). However, they explicitly do NOT track crew radiation exposure. I think it's a "See no evil, hear no evil" sort of situation. If they did track exposure, there's the possibility that all sort of US radiation-worker laws might apply. Generally, these rules only apply to exposure to radiation from radioactive sources, equipment, and reactions and never to cosmic radiation. Also some complicated rules apply to when a worked is "declared pregnant" as some rather stringent limits come into play. If a woman doesn't declare her pregnancy, she could look like Demi Moore on the cover of Vanity Fair, and no one can say anything.