Ironically the lead itself is sometimes the source of the radiation causing problems (Pb-210). One small benefit of lead free electronics! Some experiments hav

Ironically the lead itself is sometimes the source of the radiation causing problems (Pb-210). One small benefit of lead free electronics! Some experiments have used 2000 year old Roman lead to avoid this http://www.nature.com/news/2010/100415/full/news.2010.186.html http://www.nature.com/news/2010/100415/full/news.2010.186.ht... See also https://en.wikipedia.org/wiki/Low-background_steel https://en.wikipedia.org/wiki/Low-background_steel