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Neutron fluence per Gy at the patient plane during a classical radiotherapy treatment. LINAC VARIAN 2300 CD 18 MV. SSD = 100 cm; photon field = 10 × 10 cm2; jaws 10 × 10; multileaf 40 × 40. Simulation carried out by MCNP4B-GN (NEA 1733) code at 3 cm from isocenter.
