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Archaeology turns to superconductivity

Archaeology turns to superconductivity
trefwoorden: dateren - nieuwe methode - supergeleiding
Researchers from Israel have developed a new way to date archaeological objects that is based on superconductivity.
The new technique relies on measuring the magnetic signal from lead - which was widely used in antiquity - in samples that have been cooled to cryogenic temperatures. The method could be used to date pipes, coins, bottles and other objects.
Lead is stable in many environments and corrodes only very slowly into lead oxide and lead carbonate. It becomes a superconductor when cooled below 7.2 Kelvin, whereas the corrosion products do not.

Lees verder bij: Physics Web (7 augustus 2003)