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The importance of build-up thickness in the dose increase produced adjacent to voids in tissue-equivalent material exposed to 10-35 MeV electrons.

Abstract The increase in dose adjacent to voids was systematically measured as a function of void diameter for combinations of incident electron energy and void thickness, utilizing build-up layer thicknesses of 1/4 inch, 1/2 inch, and 1 inch. Plots of “percentage void dose” vs. void diameter are shown. Marked changes in dose are observed when the build-up layer thickness is varied.