Why does when the steel was produced affect the background radiation? A girder that existed in 1938 still existed in the 40’s and 50’s, why is it not contaminated but new steel was/is?
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>A girder that existed in 1938 still existed in the 40’s and 50’s, why is it not contaminated
It is, but only on the surface. You can grind off the surface and the inside metal from 1938 won’t have ever been contaminated by radiation.
Steel made after the 50s/60s is radioactive *all the way through*, because the radioactive contamination was *mixed into the molten metal itself* while the steel was being made.
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