There's supposed to be a test to tell if lead was mined before the nukes were being tested. All I can remember was if the lead was mined & smelted before the nuclear tests it commanded a much higher price and a few of the bigger recyclers could do the test. This is from my old as dirt under caffeinated memory. If anyone else can elaborate please chip in & fill in the facts for me please.
Low alpha lead was produced before the atomic testing that has been giving the world cancers.....