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"Evolutionary success ... is going to absolutely require mobility on, at a minimum, an interplanetary scale. We either go or we die out."
- Richard Morgan

Neutronic Shielding  
  Very high density monomolecular shielding  

What if you needed to move radioactive materials in an ordinary briefcase, in such a way that the materials are completely shielded?

"suppose a special shield had been used, a very special shield, say, maybe just a monomolecular layer of neutrons packed in tight like a mosaic ... An invisible skin built right into the wall of a briefcase, completely impermeable to any radiation..."
From The Sign of the Tiger, by Alan Nourse (w/Meyer).
Published by Amazing Science Fiction Stories in 1958
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