A most interesting paragraph for those who may not read the whole article: "Since the first atomic tests in the 1940s all new steel is contaminated by the radi

A most interesting paragraph for those who may not read the whole article: "Since the first atomic tests in the 1940s all new steel is contaminated by the radioactivity that is present in the air and is drawn into the furnaces during production. When uncontaminated steel is needed for medical and scientific instruments it can only be obtained from metal produced before the first atomic test. So it is that small amounts of steel are occasionally salvaged from the Koenig to make instruments. Some of these instruments are used in the space program and part of a WWI German battleship has been to the moon."