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Effect of various atomic number absorbers on skin dose for 10-MeV x rays.

The skin-sparing effect associated with high energy x- or gamma-ray beams may be reduced or lost under certain conditions of treatment. Current trends in using large fields, shield-carrying trays, and isocentric methods of treatment have posed problems of increased skin dose which sometimes become a limiting factor in giving adequate tumor doses. This paper presents a discussion of the problem in the case of 10-MeV x rays. Phantom surface dose was measured relative to the maximum dose at depth as a function of field size, absorber surface distance, and atomic number of the absorber.