Q. Cobalt-60 is commonly used in radiation therapy because it emits? Answer:
Gamma rays.
Notes: Cobalt-60 (60Co) has been used for radiotherapy cancer treatment, food irradiation and industrial applications. As cobalt-60 decays into a stable nickel-60 isotope, two wavelengths of high-energy gamma-rays are emitted (1.17 and 1.33 MeV- average of 1.25 MeV used).