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Results from Monte Carlo simulations and analytical models predictions of neutron equivalent dose per therapeutic dose (H/D) in the water phantom as a function of vertical distance (a) and (b) and lateral distance (c). These values were for a specific condition (an unmodulated 250 MeV proton beam incident upon a medium-sized closed aperture). Analytical model (new) is from this study, analytical model (old) is from Zheng et al (2007).
