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Re:Cosmic rays causing 30k network malfunctions in Japan eac... by supernova87a on Wednesday April 07, 2021 @01:11PM (#26727759)
Water is also a good protector. And the polyethylene is actually a proxy for "hydrogen atoms". The reason is that dense hydrogen has a lot of protons to interact with the incoming radiation.

But unfortunately plastic bags are not dense polyethylene. You would kind of need full blocks of solid polyethylene...

Re:Cosmic rays causing 30k network malfunctions in Japan eac... by teachtwolearn on Wednesday April 07, 2021 @04:41PM (#26730945)
You can make solid polyethylene out of plastic bags by pressing them in a mold heated to ~100-150C.

But it's quite flammable, so you might not want to use it as a building material.