that's all you need anon. protons are stopped by anything, even a sheet of paper will do the job. electrons are stopped by anything conductive, such as tin foil. free neutrons are an issue in a nuclear blast zone, but less so in the van allen belts which are magnetic fields that only interact with charged particles. the only remaining issue is the gamma rays, which would require 10 feet of concrete or steel to stop. so it's impractical, and they just take the hit
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