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Quantitative measurement of the increase in dose adjacent to voids during irradiation of a lucite phantom by high-energy electron beams.

The perturbation of dose distribution caused by small air cavities during electron-beam therapy is a well known phenomenon (1). When a void is present in a volume of material irradiated by highenergy electrons, more electrons will be scattered into the void than will be scattered out. This results in an increased dose in the material near the surface of the void on the side opposite the incident beam. This dose is greater than would be measured if the complete segment of material bounded by the edges of the void in the dimension parallel to the beam and of infinite dimensions perpendicular to the beam were removed to form the void. The increase in dose, which is a complex function of the dimensions of the void, the depth of the void below the surface of the material, and of the energy of the electrons, may result in severe radiation reactions during therapy, particularly in the treatment of tumors of the head and neck. In this investigation a Lucite phantom was constructed which allowed the diameter of th...