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Here are some things that stop almost all the BetasBy George W. Dowell
12 sheets of paper. 2 thin sheets of copper (.005") 2 thin sheets of fiberboard 1 Fiberglas-epoxy PC board material, no copper covering .060" 14 inches of air 5/8 " of plywood 2mm aluminum the thinnest lead sheet I haveJust a quick series of tests but fun. When 2 thickness are listed, it indicates a substantial amount of Betas get through only 1 sheet of that material.
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