Abstract
The results of the authors' experiment agree well with the results of Stargardt and Angerstein (1975), Reiss and Steinle (1973) and Dick et al. (1978) when the equation given is used to calculate the scatter fraction from the ratio Ls/Lp. The authors also agree that the variation of either F or Ls/Lp is negligible when the tube potential is greater than 80 kVp. At lower tube potentials and for larger field sizes and smaller magnification factors, however, they do observe a tube potential variation as did Stargardt and Angerstein (1975) and Reiss and Steinle (1973).

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