title: Letter: Errors in cobalt teletherapy timer units.
mesh_terms: D003037:Cobalt Radioisotopes / Q000627:therapeutic use*; D008722:Methods; D011867:Radioisotope Teletherapy; D011879:Radiotherapy Dosage; D013995:Time; D014894:Weights and Measures
chemical_list: D003037:Cobalt Radioisotopes