Uranium has a very long radioactive half life, it takes approximately 36 million years for half of your uranium to disappear. The radioactive byproducts of uranium fission can be more active and thus smaller quantities are dangerous. The uranium has the exact same potential energy, it’s the human influence speeding up the process and gathering it into large quantities, combined with the danger remaining for many thousands of years makes storing it safely a lot more complicated than it may initially seem.
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