Like natural nuclear reactions producing things like 142 Nd & 99 Ru https://en.m.wikipedia.org/wiki/Natural_nuclear_fission_reactor https://en.m.wikipedia.org

Like natural nuclear reactions producing things like 142 Nd & 99 Ru https://en.m.wikipedia.org/wiki/Natural_nuclear_fission_reactor https://en.m.wikipedia.org/wiki/Natural_nuclear_fission_reac...