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Take the small billets, lower them down into a dry salt mine 10,000 feet down, and recast them into a bigger billet. (That was going to be done in Nevada USA, but the anti nukes had a hissy fit.) Any civilization able to dig down to 10,000 feet to get at them will have the brains to know what to do with them.
Gamma ray are electromagnetic radiation, just like sunlight. Lead blocks them the same as a rock blocks sunlight....
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