For comparison I have seen statistics that a granite countertop, or granite flooring can emit around 1.7 microsieverts per hour. Granite is mildly radioactive. I imagine working in an old 1920s era office building with granite column facing materials and granite hallway flooring would be a lot more radiation load on the body, unless you spent dedicated time every day seeking out and handling gas lamp mantles.

Lots of people have marble and granite countertops in their kitchen...