The problem with lawyers (like @chesaboudin) running our society, is that they can convince themselves of some pretty crazy things. Chesa always talks about a safe amount of Fentanyl. What's the safe amount of Uranium a person can consume?
Uranium oxide (UO2) should never be consumed. Although a chunk of UO2 sitting on a countertop is fairly safe. UO2 used to be applied to Fiestaware to give it a lovely glazed coating (the red ones had the most). Today, such Fiestaware is highly collectable.