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#126 2017-05-19 16:24:13

Oldfart1939
Member
Registered: 2016-11-26
Posts: 691

Re: Apollo 8, redux

New acronym: BNNT. Please explain!

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#127 2017-05-19 16:36:31

kbd512
Member
Registered: 2015-01-02
Posts: 1,021

Re: Apollo 8, redux

Oldfart1939,

BNNT = Boron-Nitride NanoTube

NASA is adding extra Hydrogen to BNNT's for GCR protection.  It's the lightest and best performing GCR blocker known to science, thus far.  It's good at stopping Solar Particle Events (SPE's), too.  Even so, the PE water tank at the base of Cygnus is where the crew must be during a SPE.  The BNNT panels are just dead weight.  Cygnus is a thin aluminum can, like an ISS module.  The GCR's produce secondary particle showers when they strike thin metal plates.  The BNNT panels are intended to stop the secondary showers and slow the GCR's.  There's no such thing as completely blocking heavy ions in an aerospace vehicle, but we can filter out the protons (90% of the radiation), slow the heavy ions to the extent practical, and capture secondary particles thrown off the aluminum plate when GCR's impact the aluminum pressure vessel.

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#128 2017-05-19 20:07:45

Oldfart1939
Member
Registered: 2016-11-26
Posts: 691

Re: Apollo 8, redux

Then these BNNT should be encapsulated in a polyethylene matrix, which also is a decent cosmic ray shield. Polyethylene-type polymers are very effective against H+ (protons).

Last edited by Oldfart1939 (2017-05-19 20:19:36)

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