When it’s clean and safe enough for ordinary people who aren’t as aggressively hidebound as you, then get back to me about which particular isotope is so friggen important to you.
In other words, you’re admitting you’re mindlessly parroting the anti-nuke propaganda about “highly-radioactive for countless millennia”, since you can’t name a single isotope produced by any of those events that will remain significantly radioactive for anywhere near the “10,000 years” you shriek about.
Some of the stories claim “20,000 years”. Why don’t you use that figure?