title: Conversion of PDD for photon beams from one SSD to another and calculation of TAR, TMR and TPR.
authors.affiliation: National Physical Laboratory, Teddington, Middlesex.
authors.forename: J E
authors.initials: JE
authors.lastname: Burns
mesh_terms: D006801:Humans; D008962:Models, Theoretical; D017785:Photons / Q000627:therapeutic use*; D011874:Radiometry / Q000379:methods; D011879:Radiotherapy Dosage; D012542:Scattering, Radiation