OT: Clean steel? more info

More info for Sellam http://www.geocities.com/darrenmilford/scuttle.html Bayern as raised in 1933. She fetched a scrap value of ?110,000 nearly half of which was profit. The salvage operations on the various ships started in the early 1920's with most of the ships having been raised by the late 1930's. Since then fragments of ships have been raised and since Hiroshima they remain an important source of quality radioactive free metals necessary for certain types of sensitive scientific instruments http://users.accesscomm.ca/shipwreck/index7.htm Radioactivity in the atmosphere has increased over time with the continual testing of atomic bombs of all types. Steel makers need vast amounts of air to make steel so it would follow that steel made nowadays contains certain amounts of radioactivity. Prior to dropping the first A bomb in 1945, steel was radioactive free, and the only source of this 'clean' steel left lies in pre 1945 wrecks that lie on the seabed. Mike