[ExI] L5 society and infections
hkeithhenson at gmail.com
Sat Mar 21 22:11:51 UTC 2020
On Sat, Mar 21, 2020 at 8:03 AM spike jones via extropy-chat <
extropy-chat at lists.extropy.org> wrote:
> That problem turns out to be far more difficult than it sounds. An
> atmosphere is a great way to filter some kinds of particularly harmful
I know this area moderately well. Do you have a pointer to "some
kinds of particularly harmful radiation."
> A sheet of metal creates a bunch of secondary particles when
> struck by high-energy particles. To filter out the bad stuff requires a
> lot of material.
It takes 6 m of polyethylene to get the radiation down to 20 mS/yr.
About 10 m of rock will suffice. This is what killed power satellites
being constructed by humans. The smallest rotating habitat took
60,000 tons of shielding.
> This makes me think we must have a way to use material
> already out there, such as from the asteroid belt.
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