It is common to run a spectral gamma ray that separates out the Potassium, Thorium, and Uranium components of the radioactivity when you run a well log in the Permian Basin. The Permian is considered to have "Hot" radioactive water. When you run your well log analysis to look for clays, you strip out the uranium contribution so that you are able to see only the radioactivity from the KTH (Potassium and Thorium) components. The KTH components as supposed to indicate the radioactivity of the rock and not the water.
Often times we you want to remove old oilfield equipment, you can call a scrapper and they will bring out cutting torches and chop everything to pieces and haul it off. No money exchanges hands, the metal is the payment. The scrappers will bring a geiger counter to determine if it is safe to chop up or not. I know of some equipment that has been "abandoned in place" because the scrappers won't take it due to the high radioactivity and companies don't want to spend the money now to call in a hazmat crew to properly dispose of it.
This article makes me want to wash my hands before eating a sandwich. I never realized the dangers of the radioactive scale and breathing the dust. I have felt samples of scale from tubing, flow lines, and separators with my fingers. I literally have samples sitting in my office about 4 feet from me. I am so accustomed to all of the water handling equipment that I have never even considered any type of danger around it because there are so many other things in the oilfield that can kill you now that the water seems harmless.
I was told that Ohio has lots of active salt water disposal wells because Pennsylvania does not have the geology to support drilling disposal wells. I'm not sure if it is due to the geology, permitting, or something else. Though, I worked for an operator that hauled water 6 hours each way from well sites in Pennsylvania to disposal wells in Ohio because it was the most economic way to dispose of the water.