Sat, 07 Aug 1999 20:23:40 -0700
At 15:31 8/7/1999 +0800, you wrote:
>i haven't really watched 0083 but would having lead inside the shield be as
>effective? how thick would the lead be if it was inside?
No. Lead is used for shielding on Earth because it's plentiful and cheap,
not because it's efficient. It's not the densest element -- that title
goes to osmium -- but it's the densest *common* element.
And, while lead might be good for stopping radiation, it's low conductivity
and even lower melting point make it a poor choice for thermal shielding.
A titanium shell filled with a circulating thermal conductor that also
blocks radiation would be best and good old water fills the bill.
And, as noted in previous posts, that same water supply can also double as
both propellant and reactant.
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