Go ahead and clear out those dangerous conditions, dude. Not just 10,000 years but 20,000 years. 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.
Then we can get past the “only 2 you have mentioned”. There are dozens more isotopes that you have not mentioned so ... just get lost. You’re completely disingenuous.
There are dozens more isotopes that you have not mentioned so ...
You’re right.
There are others.
Name one that’s got a half-life longer than 50 years.