title: [Theoretical and practical problems of filter irradiation in telecobalt therapy].
mesh_terms: D003035:Cobalt; D003037:Cobalt Radioisotopes; D005374:Filtration; D006801:Humans; D011851:Radioactivity; D011878:Radiotherapy
chemical_list: D003037:Cobalt Radioisotopes; D003035:Cobalt
keywords: COBALT/radioactive; RADIOTHERAPY