Berlin Rosenthaler Platz U-Bahn is decorated with radioactive glazed tiles

Dang, can you please mark this thread as duplicate? I see that newer post with same topic is No1 on HN so it would make sense to merge this post into https://news.ycombinator.com/item?id=34691489.

I know that a lot of materials have background radiation. Could this also be the case? That the tiles were made from some clay/stones that are naturally radioactive?

EDIT: fixed typo

https://en.wikipedia.org/wiki/Uranium_tile

"Uranium tiles have been used in the ceramics industry for many centuries, as uranium oxide makes an excellent ceramic glaze, and is reasonably abundant

Vibrant colors of orange, ... during that period (circa 1920–1940) used bathroom or kitchen tiles that had been glazed with uranium. These can now be detected by a Geiger counter"

Apparently not dangerous, if you don't lick it, or grind it up and inhale dust, etc.

As a kid I was listening stories about cobalt blue and that dishes wit that color were radioactive. https://en.wikipedia.org/wiki/Cobalt_blue

Oh, and I just came across this https://www.orau.org/health-physics-museum/collection/consum...

Is this code for something? Seeing it on many sites. Red striped shirts.

What are you referring to?