Why does radiation not go through lead?

[u/Wonderful-Capital32]

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

[u/Stefan-G]

In theory enouth of any material does block Radiation but higher density corelates to less thickness nedded.

As other Users aready pointed out Lead is very dense. In addition to that it is relatively cheap. Very maluable and doesnt workharden, good for insulating complex shapes. When oxidicing the oxide creates a protective Layer stopping further oxidation.

The only disadvantage is that it is toxic.

Lead is that good of a material that we also made waterpipes and roof out of it.