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"Human beings hardly ever learn from the experience of others. They learn; when they do, which isn't often, on their own, the hard way."
- Robert Heinlein

Radiation Shield  
  A clever use for the water you need to take anyway.  

"You mean they bathed that ship in neutrons?"

"Shot it full of 'em. Just like our proton guns, only sending neutrons."

"Well, why weren't we killed too?"

"Water stops neutrons," Kendall said. "Figure it out."

"The rocket-water tanks - all around us... that saved us?"

From The Ultimate Weapon, by John W. Campbell.
Published by Unknown in 1936
Additional resources -

Compare to the ozone radiation shield in A Daring Trip to Mars (1932) by Max Valier.

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Additional resources:
  More Ideas and Technology from The Ultimate Weapon
  More Ideas and Technology by John W. Campbell
  Tech news articles related to The Ultimate Weapon
  Tech news articles related to works by John W. Campbell

Radiation Shield-related news articles:
  - NASA's New Radiation Shielding First Proposed By John W. Campbell In 1936
  - Active Electrostatic Radiation Shielding For Space Craft

Articles related to Space Tech
Space-Based Solar Power A Priority - European Space Agency
Goldilocks Zones Found On The Moon
Spaceships Should Last So Long
Space Station Shutters

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