A simple model of 60Co beams for computerized radiotherapy planning

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Abstract
A mathematical model of the dose in tissue from a beam of 60Co .gamma.-rays was presented which was based on a novel fitting formula for the lateral profiles and the properties of decrement lines. Four parameters completely specified an open field and 6 parameters a wedged field to a good precision, as measured by the isodose RMS [root mean square] error of fit. A consequence of the method is that only 1 lateral profile at a depth of 10 cm was measured, for open and wedged fields, in order to describe the whole field. The model was suitable either for computers or programmable calculators.