title: A simple model of 60Co beams for computerized radiotherapy planning.
abstract: A mathematical model of the dose in tissue from a beam of 60Co gamma rays is presented which is based on a novel fitting formula for the lateral profiles, and the properties of decrement lines. Four parameters completely specify an open field, and six parameters a wedged field to a good precision, as measured by the isodose RMS error of fit. A consequence of the method is that only one lateral profile at a depth of 10 cm needs to be measured, for open and wedged fields, in order to describe the whole field. The model is suitable either for computers or programmable calculators.
mesh_terms: D003037:Cobalt Radioisotopes; D003201:Computers; D008433:Mathematics; D008962:Models, Theoretical; D011867:Radioisotope Teletherapy; D011879:Radiotherapy Dosage
chemical_list: D003037:Cobalt Radioisotopes