If world-war-2 steel still emits too much radiation for your application, maybe you'll want to shield your experiment with 2000 year old lead bricks from a sunk

If world-war-2 steel still emits too much radiation for your application, maybe you'll want to shield your experiment with 2000 year old lead bricks from a sunken roman vessel? http://www.aspera-eu.org/index.php?option=com_content&task=view&id=418&Itemid=98 http://www.aspera-eu.org/index.php?option=com_content&task=v...