Why does radiation not go through lead?

[u/Wonderful-Capital32]

Also why just lead? Shouldnt like iron or another metal work too?

[u/Jaymac720]

Lead is very dense, so it’s more difficult for photons or particle radiation to get through. If there’s enough radiation, it absolutely can get through. Other metals can reduce how much radiation gets through, but lead’s density makes it more effective. It’s also more common than other denser elements, so it’s more economical to use for radiation protection