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Re: Radiation in space



If parrifin is good, what about parrafin sealed in a plastic container?

Bob Bruninga wrote:
> 
> Miles,
>    I was surprised when I wanted to put LEAD around my CPU in the
> satellite we are building.  (We had no mass restrictions)  The experts
> said that lead doesnt really do anything to help against neutrons.
> Neutrons are "scattered" by Lead, but not slowed down at all.  Further.
> they said aluminum is worse, when neutrons hit aluminum it generates a
> splatter of all kinds of particles which actually increase your chances of
> a CPU upset.
> 
>     The best thing that will absorb neutrons is Hydrogen such as water or
> parrifin.  Apparently the neutron grabs a hydrogen an becomes helium which
> slows it down.  But I bet Parrafin outgasses and brings its own problems.
> 
>    Since we got bumped, we never persued this further.  But I would like
> to hear from any experts about retro-fit radation hardening of commercial
> chips in space...
> 
>    Oh, they also say that the electrons and Protons are effectively
> blocked by other materials, they seemed to only think Neutrons
> were the problem...???
> 
> bob, WB4APR
> 
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