Abstract
In treatment of certain lesions, it is desirable to use the electron beam because of its depth dose profile. In practice, one often finds that the desired treatment area is larger than the largest cone available. In such cases it is customary to use two adjacent ports separated by a distance. The separation distance is a very important parameter, all other factors being the same, in obtaining a reasonably homogeneous distribution within the tissue equivalent medium at a stated depth. Investigation of separation between two electron ports of specified dimensions and energy was carried out using a D.E.C. RAD-8 Digital Computer. The computer generated isodoses were compared with isodose measurements made with Kodak type R film in a Prestwood phantom. There is a close agreement between the experimentally measured isodose curves and those generated by the computer. This investigation was carried out with beam energies of 16 and 25 MeV, and fields from 6*8 cm to 10*12 cm for various separation distances. The computer generated isodose curves are catalogued and filed for easy access by the radiotherapist.
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