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LINAC head simulated by MCNP4B-GN code. LINAC VARIAN 2300 CD 18 MV. Target (made up by tungsten and copper), flattering filter (iron and tantalum), primary and secondary collimators (tungsten), are represented. Section on plane y = 0. The origin of the reference system is placed in the centre of target and the z axis is directed downward, along the isocenter line.
