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cobalt(Co)  (ko´bawlt)   a chemical element, atomic number 27, atomic weight 58.933.
 

cobalt 57  a radioisotope of cobalt, atomic mass 57, having a half-life of 270 days; used as a label for cyanocobalamin. Symbol 57Co.

cobalt 60  a radioisotope of cobalt, atomic mass 60, having a half-life of 5.27 years and a principal gamma ray energy of 1.33 MeV; used as a radiation therapy source. Symbol 60Co.





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