Effects of source-degrader distance on depth dose distribution in total skin electron beam Irradiation.

Abstract

Total skin electron beam irradiation is suitable for the treatment of widespread skin lesions. To reduce electron beam energy, the degrader is widely used in total skin electron beam irradiation. In this study the effects of source-degrader distance on dose distribution were investigated. Measurements include depth dose, photon contamination and dose rate at the depth of maximum dose for various source-degrader distances. A greater source-degrader distance resulted in lower x-ray contamination and a higher dose rate at the skin. It is concluded that the degrader should be placed closer to the patient.