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joewein

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Oct 25, 2011
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#3
I agree with one of the comments that this is most likely from scrapped medical equipment. Cobalt-60 is used in hospitals for radiation treatment of cancers. Some of that probably ended up in a scrap pile somewhere and got recycled into stainless steel. It's happened before.

From: http://en.wikipedia.org/wiki/Cobalt-60#Safety
Cobalt is an element of steel alloys. Uncontrolled disposal of 60
Co in scrap metal is responsible for the radioactivity found in several iron-based products.