title: Particle radiation therapy: the first forty years.
mesh_terms: D002142:Californium / Q000627:therapeutic use; D004601:Elementary Particles; D005214:Fast Neutrons; D006371:Helium / Q000627:therapeutic use; D006801:Humans; D007477:Ions; D009369:Neoplasms / Q000532:radiotherapy*; D010190:Pancreatic Neoplasms / Q000532:radiotherapy; D010315:Particle Accelerators; D010910:Pituitary Irradiation; D011522:Protons; D011882:Radiotherapy, High-Energy
chemical_list: D007477:Ions; D011522:Protons; D006371:Helium; D002142:Californium