Just a kind of random thought here ....
Getting plutonium safely away from Earth and to some
moon base, or orbital construction facility near the moon, or at a libration
point, seems like a real challenge. To do it economically might be even
more of a challenge. How do you package it for all scenarios? For
fission-powered probes to Jupiter, this might be the biggest political and
technical challenge of all.
I don't think I can address all scenarios with one
idea, but ... I read a book by Freeman Dyson's son, about Project Orion, in
which an interesting experiment was devised at thermonuclear bomb test
sites. They dangled some metal spheres (copper, IIRC) fairly close to
ground zero. These spheres survived with remarkably little damage.
And were used as supporting evidence that Orion could work.
Last year, a friend of mine, professor of mechanical
engineering, sent me a copy of a formal request for proposals for some
research into demisable satellite fuel tanks, asking if I had any ideas. I
sent him a few, and I don't know what's become of my suggestions, but it struck
me: a hollow metal object is pretty hard to kill with atmospheric reentry.
Most satellites self-dispose of their parts pretty nicely, and could be made
even better in this respect with more investment. But tanks made of
aluminum alloys frequently come back nearly intact. Getting them to burn
up nicely is actually a hard, and largely unsolved, problem.
Well, so roughly spherical, mostly empty, metal
objects are tough buggers. Make the most of it. Send plutonium up
inside spheres, suspended in a mesh of very strong wire or fiber. Your
rocket blows up? It's OK, so long as you can track the payload.
Launch goes off course and the payload reenters? It's OK, so long as you
can track it. Something hits it (debris, meteor) in transit ... well,
that I can't tell you anything about. But maybe there are shielding
concepts that are both lightweight and strong enough to handle almost anything
at this point.
No point in thinking about patenting something that
almost certainly won't get used within the lifetime of the patent. Who has
time, anyway? And for all I know, somebody else has thought of this
already, and it's full of holes. FWIW.
-michael turner
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