title: Build-up measurements in air cavities irradiated with 6 MV or 42 MV x-rays.
mesh_terms: D000042:Absorption; D000388:Air; D003037:Cobalt Radioisotopes; D008954:Models, Biological; D011137:Polystyrenes; D011829:Radiation Dosage; D011830:Radiation Effects; D011879:Radiotherapy Dosage
chemical_list: D003037:Cobalt Radioisotopes; D011137:Polystyrenes