low-background lead

English

Noun

low-background lead (countable and uncountable, plural low-background leads)

1. Lead with low inherent radiation levels, suitable for instruments and experiments highly sensitive to radiation.
2. Lead sourced from ancient shipwrecks, where the deep sea environment has kept it from accumulating radiation from outside sources, and where inherent radiation has decayed away in the time it has been sunk.
3. Used other than figuratively or idiomatically: see low-background,‎ lead.