title: A study on the effect of 60Co gamma ray irradiation on the abrasion of dental polymethylmethacrylate (part 4).
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003037:Cobalt Radioisotopes; D005720:Gamma Rays; D008768:Methylmethacrylates / Q000528:radiation effects*; D009502:Neutrons; D013499:Surface Properties
chemical_list: D003037:Cobalt Radioisotopes; D008768:Methylmethacrylates