There's radioactive ore in Indiana! --At least according to this map. Pssst! Don't tell the EPA!
H'mm, looks like it might be around Turkey Run State Park. Don't mind the Geiger counter, Mr. Ranger. (Update: We're talking very low-grade shales, detectible but you're not gonna do yourself any harm if you have a picnic on an outcropping. I'd be very surprised if the area actually overlaps the park, it was just interestingly close).
3 months ago