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@h2o
http://www.theguardian.com/world/2013/dec/06/mexico-hospital-six-people-radiation-poisoning
The International Atomic Energy Agency said the cobalt has an activity of 3,000 curries, or Category 1, meaning "it would probably be fatal to be close to this amount of unshielded radioactive material for a period in the range of a few minutes to an hour."