Abstract
Multiplicative corrections for percent depth-dose values were measured for situations with nonmaximal backscatter because of reduced thickness of the irradiated phantom. Data were obtained for common clinical field sizes for a 60Co beam as well as beams from a 2.5-MV and a 4.0 MV generator. Functional forms, which summarize the results and include field size effects, depth, and thickness of the backscatter medium as variables, were obtained by regression analysis.
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