The next longest-living nuclide is 92 Nb with a half-life of which had to survive at least 132 half-lives since the earth formation, meaning its original concentration has decreased by a factor of 10 40.
The next longest-living nuclide after this list is 92 Nb with a half-life of. To be detected primordially, this nuclide would have to survive at least 132 half-lives since the earth formation, meaning its original concentration will have decreased by a factor of 10 40.