Low Background Steel
Summary
This episode explains how atmospheric nuclear testing since 1945 contaminated modern steel with radioactive isotopes, creating a niche demand for pre-1945 "low background steel." Scientists require this pristine metal for sensitive radiation detectors, leading to the illegal salvage of WWII shipwrecks that were shielded from cosmic rays underwater. The discussion also covers ancient Roman lead and uses low background steel as a metaphor for pre-AI internet content.
Topics discussed
Intro: Atomic bombs, shipwrecks, and sponsors Quince & Babel
Overview of modern steel making and the Bessemer process
Atmospheric nuclear testing and global radioactive fallout
Natural background radiation vs. nuclear fallout impact
What is low background steel and why it is needed
Sourcing pre-1945 steel and cosmic ray contamination
Illegal salvage of WWII shipwrecks for low background steel
Other low background materials like ancient Roman lead
AI metaphor, conclusion, and show credits
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