“In the case of microplastics, many researchers are drawing closer to the possibility that there are no humans left in the developed world who have not been exposed to them.” https://medshadow.org/the-impact-of-microplastics-cant-be-studied-because-there-is-no-control-group/

“… it is often used for modern particle detectors because more modern steel is contaminated with traces of nuclear fallout.” https://en.wikipedia.org/wiki/Low-background_steel

We’ll be dealing with the after effects of the early Anthropocene for eons.