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Related to Cobalt-60 isotope: cobalt 57, 57Co

cobalt-60 (60Co)

a radioactive isotope of the element cobalt with a mass of 60 and a half-life of 5.2 years. 60Co emits high-energy gamma rays and is the most frequently used radioisotope in radiotherapy. It must be stored in a position well shielded by lead or uranium.


A radioactive isotope of cobalt, having a half-life of 5.27 years. It formerly served as a source of beta and gamma rays in radiation units used to treat malignancies. Modern radiation units have replaced cobalt-60 by higher-energy sources, e.g., linear accelerators.


a chemical element, atomic number 27, atomic weight 58.933, symbol Co. A component of vitamin B12. See Table 6.

a radioisotope of cobalt having a half-life of 270 days; used as a label for cyanocobalamin. Symbol 57Co.
a radioisotope of cobalt 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.
cobalt nutritional deficiency
causes anorexia and poor weight gain. Identification of the disease is based on chemical analysis of pasture and soil and biochemical analysis of animal tissues and fluids. Called also enzootic marasmus, Grand Traverse disease and other regional names.
cobalt poisoning
accidental overdosing with cobalt causes listlessness, weight loss and incoordination.