Roman Ingots to Shield Particle Detector

This odd story marries archeology with physics. Roman lead ingots mined 2,000 years ago are an archaeological treasure. They are also perfect for shielding a nuclear particle detector for cutting-edge physics experiments.
The 120 lead ingots, each weighing about 33 kilograms, come from a larger load recovered 20 years ago from a Roman shipwreck, the remains of a vessel that sank between 80 B.C. and 50 B.C. off the coast of Sardinia. As a testimony to the extent of ancient Rome's manufacturing and trading capacities, the ingots are of great value to archaeologists, who have been preserving and studying them at the National Archaeological Museum in Cagliari, southern Sardinia. What makes the ingots equally valuable to physicists is the fact that over the past 2,000 years their lead has almost completely lost its natural radioactivity. It is therefore the perfect material with which to shield the CUORE (Cryogenic Underground Observatory for Rare Events) detector, which Italy's National Institute of Nuclear Physics (INFN) is building at the Gran Sasso laboratory. -via Evil Mad Scientist Laboratories

(image credit: INFN/Cagliari Archeological Superintendence)

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This is quite common, a lot of metals produce after ww2 are too contamianted with nuclear fallout. The metal from WW1 scuttled ships in Scapa Flow, I believe, have been in outer space.
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