Nuclear waste has decay products Uranium naturally lacks those
Discussion
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Once it has been used in a fission reactor the uranium becomes unstable and will decay into other smaller elements. The decay process releases radiation that can be damaging to organic life.
Note however that the amount of radiation decreases exponentially over time.
There is very little nuclear waste in the world and it is very well contained. Risks from nuclear waste are significantly lower than the risk from toxic solar panels in a landfill.