William Mook wrote:


The Martian surface is exposed to 7.6 REM per year


If you're only there during deep solar minimums and staying in a hole
so that you get extra atmospheric shielding. THIS is what's wrong
with you, Mook. You go scavenge up a source, don't understand what it
says and what conditions it's under, then make entirely stupid
pronouncements. Average annual exposure at datum height will be 11
REM at solar maximum and 38 REM at solar minimum. If you plan on
being there all the time you need to plan on at least 30 uSv per hour.


- and with 25 g/cm2 of ice (water or CO2) you cut it back to less than 0.26 REM per year.


Bull****. Worse than bull****; it's an outright and transparent lie.
Shielding of dry ice against GCRs (which are mostly what reaches Mars'
surface) is much poorer than water ice. GCRs are stopped best by
hydrogen rich compounds like water. They are stopped much more poorly
by hydrogen poor compounds like CO2.


--
"Ignorance is preferable to error, and he is less remote from the
truth who believes nothing than he who believes what is wrong."
-- Thomas Jefferson