(redirected from Co-60)
Also found in: Dictionary, Encyclopedia.
Related to Co-60: Cs-137, Sr-90

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.
References in periodicals archive ?
Dosimetric consistency of Co-60 teletherapy unit-a ten years study.
Figure 2b presents the Co-60 concentrations as functions of M = [mt.
Figure 4a, b shows the H-3 and the Co-60 concentration profiles presented in this water-based coordinate system.
Specifically, the locations of the profiles in water-space reveal precisely the consequence of cation exchange (which retards the Co-60 front relative to the water piston front).
Consolidation' of the Co-60 data by normalising the space-like coordinate according to S is more striking.
Thus, high concentrations of Co-60 close to G*(M)/S = -1 for the natural soil are associated with reduced penetration of the leading edge of the values of the Co-60 profile.
1) Expressing the Co-60 concentration data in terms of unit mass of clay rather than unit mass of soil.
As before, this accounts for the different amounts of Co-60 in each column because different amounts of solution and hence Co-60 are absorbed in each experiment.
i], the concentration of Co-60 in the absorbed solution (207 Bq/g when expressed in molal convention), as it should, bearing in mind the data scatter.
KIPT explained that the newly delivered Varian 2300 will allow substantial improvement of patient management, allow enhanced safety of radiation treatment due to shorter irradiation times compared to depleted teletherapy Co-60 machines, and permanently resolve security issues associated with Co-60 radiation sources.