Put it somewhere extremely hard to get to without industrialized tools. Assuming civilization doesn't collapse, any society with the kind of resources to want t

Put it somewhere extremely hard to get to without industrialized tools. Assuming civilization doesn't collapse, any society with the kind of resources to want to go back in and extract the radioactive was is going to know what radioactivity is. If you assume it does collapse, the protection you get from a lack of power tools and logistics makes breaking into the waste repository prohibitively expensive. I doubt an agrarian or non-industrial society would be able to bankroll an expedition to a place like, say, Antarctica or the Atacama Desert and then being digging thousands of feet down using hand tools and ropes to find magic rocks. An example I'd like to cite is how one of the Sultan's of Egypt tried to dismantle the pyramids and failed horribly because of all the manpower involved. https://en.wikipedia.org/wiki/Pyramid_of_Menkaure https://en.wikipedia.org/wiki/Pyramid_of_Menkaure