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It said the most serious case was five tons of stainless steel wool which had to be disposed of by a nuclear-waste company, GNS.
The contamination was thought to be the result of the radioactive isotope cobalt 60, which is used in nuclear medicine, being inadvertently mixed with steel scrap and being melted down at three Indian steel works.
Anyone near the container of steel wool, which had been intercepted in August last year in the German port of Hamburg, would have received one millisievert of radiation in 24 hours