Re: Intrinsic radiation on the Martian surface
I don't think you understand quite how solar and cosmic radiation works.
Radiation will be an issue, but dust on Mars will be IMHO a greater issue. It is dangerous just as dust here is dangerous. "Black lung" and "white lung" are no joke and we all know there are inorganic super-oxides and peroxides in the regolith of Mars. Which should make it doubly difficult to deal with.
Learning how to protect from such things is part of the mandate for going to Mars and one of the very good reasons to do the deed.
--Chris Vancil