this post was submitted on 25 Aug 2026
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Nah, that's not what they're talking about. Superman's vision is capable of penetrating concrete, but gets reliably stopped by lead. None of the particles here (or, I'm guessing, anywhere) have that property.
Gamma rays kinda do, you need 10x more concrete to block them than lead: https://en.wikipedia.org/wiki/Half-value_layer
Phew, good to know. I was beginning to think Superman isn't real.
Gammas might be able to penetrate a little bit of concrete, since concrete has lower electron density than lead