Low-background steel

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What Wikipedia says

Low-background steel, also known as pre-war steel, pre-atomic steel, or pre-nuclear steel, is any steel produced prior to the detonation of the first nuclear bombs in the 1940s and 1950s.

Excerpt from the Wikipedia article “Low-background steel”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: The federal government of the United States, Public domain, via Wikimedia Commons.