In a few spots around my base on Siptah at (L8/9) TeleportPlayer 130637 102232 -19766, get a corruption icon, most likely visual only. It shows both on the main screen and the inventory interface. I can’t see any effect on the health or stamina bar.
I have not tried to locate the spot, stand there, and see if it builds or moved my second floor entertainers.
Again, trivial, but my God, did I build on radon?