New Space Settlement image

The bottom 10 km of the atmosphere make up 80% or so of it. I would
say that is a good guess. It probably isn't that much, and a couple of
meters of water over the windows will remove most of the radiation
befor it gets into the structure.

I'd hate to be the guy who has to clean the algea growing on them
though.

Bill

--- In spacesettlers@egroups.com, "Combs, Mike"
> From: Tom Tucker (Olympia) [mailto:tntucker@c...]
>
> Soil is great for our feet, but how much atmosphere do you figure
would be
> needed for shielding?
>
> Not sure of the exact answer to this question, but I know that when
O'Neill
> got to the Island 3 stage (with 4 miles of atmosphere overhead), we
were to
> a point where a separate radiation shield was no longer necessary.
It's one
> of the reasons why Island 3 wouldn't necessarily cost 1,000 times
more to