title: Maintenance costs for cobalt machines and linear accelerators: new machines versus old.
authors.forename: Piet
authors.initials: P
authors.lastname: van der Giessen
mesh_terms: D003037:Cobalt Radioisotopes; D006801:Humans; D008284:Maintenance and Engineering, Hospital / Q000191:economics*; D010315:Particle Accelerators / Q000191:economics* / Q000600:supply & distribution; D013679:Technology, Radiologic / Q000191:economics* / Q000295:instrumentation
chemical_list: D003037:Cobalt Radioisotopes