title: In vivo beam localization by positron activation in pion therapy.
mesh_terms: D002250:Carbon Radioisotopes; D004601:Elementary Particles; D004735:Energy Transfer; D009590:Nitrogen Radioisotopes; D011829:Radiation Dosage; D011878:Radiotherapy / Q000379:methods*; D012062:Relative Biological Effectiveness
chemical_list: D002250:Carbon Radioisotopes; D009590:Nitrogen Radioisotopes