Yes, due to radon gas from the ground which is really a big problem in Scandinavia. Just making sure nobody thinks a big part of the accumulated dose when living here is due to Chernobyl.
I lived in Aberdeen, and one of its claims to fame is "Granite City"... which also means the building exhibit more radioactivity than the norm.
We've got the same problem over here in Sweden, granite in a lot of places. We also, just for good measure, constructed a lot of buildings in the 50s and 60s from radioactive autoclaved aerated concrete made from alum shale containing high concentrations of uranium. Fun days. Apparently there's still half a million homes here exceeding the radon limit of 200 Bq/m3 indoors.