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Post by guzlomi on Jun 23, 2017 22:37:36 GMT
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Post by guzlomi on Jun 23, 2017 22:38:58 GMT
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petrv
Space Pioneer
Posts: 93
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Post by petrv on Jun 23, 2017 23:45:21 GMT
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Mike
Space Pioneer
Posts: 82
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Post by Mike on Jun 24, 2017 8:29:38 GMT
Yup, as long as it can be "printed" from regolith, that would be best option. Especially for modules for Space Station. But I am more interested in "printing" actual mechanical, and electronic parts. They don't have to be compact, just easy to "print", and durable. If we could "print" all elements for sealed doors, and oxygen/water filtering systems, there will be no problem with expanding Colony.
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petrv
Space Pioneer
Posts: 93
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Post by petrv on Jun 24, 2017 17:58:34 GMT
the problem of Moon is, to be safe from cosmic radiation with no atmosphere, you need about 8meters thick layer of regolith - it seems to be too much for inflatable modules, so some inner structures have to be added - and it can be 3Dprinted.
Or there is still the possibility of use of underground lava tunnels, but you have to find appropriate locality then, not the ones with rich natural raw materials deposits...
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petrv
Space Pioneer
Posts: 93
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Post by petrv on Jun 24, 2017 18:31:08 GMT
There are also some projects specifically oriented to Regolith printing: regolight.eu/
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Post by phicksur on Jun 26, 2017 12:14:43 GMT
Radiation shielding should not be done by solid materials like that. It would be best to use liquid water as a shielding agent through having pumping systems on the exterior. You wouldn't need very much water to protect an area.
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petrv
Space Pioneer
Posts: 93
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Post by petrv on Jun 26, 2017 21:45:44 GMT
Given the average temperatures on Moon (+135C/+275F on the day side, -170C/-274F on dark side, -35C/-31F 1m under surface) it couldn´t be much energy efficient to keep water liquid there...depends on location.
But I think water will be much precious to be used this way - for simplicity: half sphere with diameter of 8 metres have surface of 100m2 x 0,5m thick it´s 50 m3 of water = 13.200 US gallons of water approx.(hope the calculation is correct)
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Post by bigred on Jun 27, 2017 3:10:25 GMT
I agree with Petrv on the inefficiency of water usage while keeping it liquid. Yes, water is the best way to divert energetic particles however if the shielding is dense enough then it shouldn't be too big a problem. A densely compressed layer of regolith brick covered by another meter or so of regolith is a good first shield. Inside could be a layer of HDPE and metal radiation blanket. This combination would fend off most problems in space. There would always be the problems of solar flares as there is anywhere outside of the earths magneto-sphere. Perhaps you could dig deeper bunkers for times when solar flares were active.
I understand any HDPE or metal radiation blanket needs to be transported however without it you would need to dig down about 8+meters, which I believe someone else pointed out.
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petrv
Space Pioneer
Posts: 93
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Post by petrv on Jun 28, 2017 23:27:45 GMT
Agree. There is also the area of MMP(micro-meteorite protection) which is usually joint with RP (radiation protection) and here the liquid water is not the best material again (regardless of some self-sealing tanks or such technology - the possibility of water-bleeding in case of bigger impact is not so low and you´d lose the shielding very quickly. So the solid shielding is the only way how to achieve the protection as well as keep the shielding working AFTER some impact.
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petrv
Space Pioneer
Posts: 93
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Post by petrv on Jun 28, 2017 23:43:16 GMT
as I wrote here spacecolony.boards.net/post/209 maybe the fine-grained dust could help with the sintering / high pressure processing of shielding materials...
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