Low-Background Steel

I came across this because I read an article about people looting old shipwrecks for the steel.

https://www.theguardian.com/australia-news/2021/oct/24/as-me...

It isn't only steel [0]. Old, low-background lead is necessary for some instruments.

[0] https://www.theatlantic.com/science/archive/2019/10/search-d...

Read about this a few years ago... Makes you wonder what other kinds of effects this has on organic things.