(HMPG, 1980-08) Groenewald, W. A.; Van der Merwe, E. J.
While high-energy photon radiation in radiotherapy of deeper tissues has a skin-sparing effect, contamination with electron and low-energy photon radiation can diminish and even abolish this effect. Experiments with perspex, aluminium and copper filtrates showed that a copper filter effectively diminished the skin dose owing to contaminated radiation.