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it seems that cobalt is but here this is from them encyclopedia
Measuring Radiation
The amount of radioactivity in a given sample of radioisotope is expressed by the new SI unit, the becquerel (Bq). The old unit was the curie (Ci). One becquerel of a radioisotope is the exact quantity that produces one disintegration per second. The curie is 3.7 x 1010 Bq disintegrations per second. Thus 1 Bq = 2.7 x 10-11 Ci and 1 Ci = 3.7 x 1010 Bq. As the becquerel is as inconveniently small for many uses as the curie was inconveniently large, prefixes such as micro ( ) (10-6), milli (m) (10-3), kilo (k) (103), and so on are routinely used. Following nuclear detonations, the amounts of radioactive material produced are very large and the terms petabecquerel (PBq) (1015 Bq) and exabecquerel (EBq) (1018 Bq) may be used. The term megacurie (MCi) (106 Ci) was once used.
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