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submitted 3 months ago by fossilesque@mander.xyz to c/science_memes@mander.xyz

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[-] aaa@lemmy.sdf.org 16 points 3 months ago

idiot here. can someone explain to me how come neutrons can't penetrate concrete compared to lead.

[-] mouserat@discuss.tchncs.de 19 points 3 months ago

Another idiot here who found this answer interesting: https://www.quora.com/Why-is-concrete-the-best-shield-for-neutrons

[-] aaa@lemmy.sdf.org 6 points 3 months ago

that's very interesting, thanks.

[-] roguetrick@lemmy.world 11 points 3 months ago

Neutrons need something that provides them with lots of chances to have interactions. Water is good too. What blocks neutrons may not block gamma and vise versa. To block neutrons and high energy particles like cosmic rays that actually have mass to them you need something like a crash barrier.

[-] jol@discuss.tchncs.de 4 points 3 months ago

Same. Aren't neutrons capable of crossing the entire planet unless they directly colide with another particle?

[-] Admetus@sopuli.xyz 29 points 3 months ago

I reckon you're thinking of the neutrino which rarely interacts with matter.

[-] Warl0k3@lemmy.world 14 points 3 months ago* (last edited 3 months ago)

I believe you're thinking of neutrinos. Neutrons love bonking into things, and they're really good at it. Too good; if the thing they're bonking is too big they'll just keep on bouncing, so you gotta bounce them off small stuff. Concrete has lots of small stuff bound up in it, so while there's better shields (borax and paraffin slurry is a classic one) there's few cheaper or easier to make shields than concrete.