Why is radiactive contamination so hard to clean up?

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I saw a video that said that Chernobyl will not be habitable for another 20,000 years. I was curious as to why it takes so long to clean up radioactive contamination? Also for Chernobyl specifically as technology progresses couldn’t we find new methods that significantly reduce the amount it takes for Chernobyl to be habitable again?

Sorry for bad Grammer.

In: Chemistry