The 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."
The curie (symbol Ci) is a non-SI unit of radioactivity, named after Marie and Pierre Curie.[1][2] It is defined as
1 Ci = 3.7 × 1010 decays per second.
While its continued use is discouraged by NIST[3] and other bodies, the curie is widely used throughout the US government and industry.
One curie is roughly the activity of 1 gram of the radium isotope 226Ra, a substance studied by the Curies.
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