Wiktionary
After the discovery or use of the atomic bom
Usage examples of "postatomic".
The postatomic horror that followed the blasts made the Bell Riots of 2024 look like a Boy Scout jamboree.
Colonies during the tumultuous postatomic horror years was well documented, despite the often fragmentary nature of many mid-twenty-first-century historical records.
Any postatomic winter would have had to encompass virtually the entire planet, since the masses of dust thrown into the stratosphere would increase the albedo of the whole surface.
For centuries, since your postatomic times at least, some prominent Terran theorists have been noticing what seem to be linkages between old traditions of your world about the way life works-the Tao,' I think the term is-and classical physics, especially the scholia that deal with subatomic particle interactions.