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W. R. Bruce, M. L. Pearson, H. E. Johns, Comparison of Monte Carlo Calculations and Experimental Measurements of Scattered Radiation Produced in a Water Phantom by Primary Radiations with Half-Value Layers from 1.25 Mm Cu to 11 Mm Pb, Radiation Research, Vol. 17, No. 4 (Oct., 1962), pp. 543-554
Bruce et al. (1962) studied this question.