Abstract
A rapid and accurate method of isodose curve construction, applicable to both flat and wedged fields for all energies and types of radiation normally used in radiotherapy, has been devised. An account is given of the theory of the method which graphically combines decrement line patterns with depth dose data. The practical application of the method to radiation for a 4 MeV linear accelerator is outlined and a simple plotting table used to facilitate the method is described.

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