<unk>  is the medical use of gamma rays from the radioisotope<unk> -60 to treat conditions such as cancer. Beginning in the 1950s,<unk> -60 was widely used in external beam radiotherapy (teletherapy) machines, which produced a beam of gamma rays which was directed into the patient's body to kill tumor tissue. Because these<unk>  machines" were expensive and required specialist support, they were often housed in<unk>  units.<unk>  was a revolutionary advance in radiotherapy in the post-World War II period but is now being replaced by other technologies such as linear accelerators.
Cobalt therapy
Chelation therapy
Ultraviolet light therapy
Lead abatement
Alcohol detoxification
Phosphate supplement
Nicotine replacement therapy
Mitochondrial replacement therapy