One was once told - at a Cockers P on HMS Caroline - that she would have enormous scrap value as she was/is one of the largest potential sources of "pre nuclear" steel.
Apparently all steel manufactured since 1945 has accrued some elements of radioctivity


- "pre-nuclear" does not so it is an essential and rare (read expensive) part of some nuclear-type measuring instruments.
Sounds plausible to me, but may just be the nuclear age version of the "golden rivet", foisted upon a gullible crab at a Cockers P........