My first question on this forum, and I'm diving in head first. While working on a project that has very little to do with physics, I stumbled upon a list of products that result from a Uranium-235 fission reaction. To my surprise, there is a lot of good stuff in that nuclear waste. Specifically, I am interested in rhodium. Considering that we have stockpiles of nuclear waste that are decades old, is there some reason that no one is centrifuging to recover rare earth elements? I fully understand that the waste is still radioactive, but the stuff I want is safer than tap water after 50 years of half-lives. Am I missing something here?