Clinically useful radiation from cobalt 60 is
Gamma radiation
Beta radiation
Alpha paicles
Photons
Cobalt units produce stable, dichromatic gamma beams of 1.17 and 1.33 MeV, resulting in an average beam energy of 1.25 MeV. The cobalt-60 isotope has a half-life of 5.3 years Reference: Eric J Hall Textbook of Radiobiology for Radiologist; 5th edition
Radiotherapy