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Figure 8: An indication of the variation in neutron dose that exists between operating at 15- and 18-MV modes, and between different linac manufacturers. This data shows MCNPX-calculated neutron doses along the plane of the couch for a Varian 2160C (15 MV and 18 MV) and Siemens Primus (18 MV) (Chibani and Ma 2003). Also shown are several measured data points for the Varian 15 MV. The subplot below the primary figure shows the ratio of these doses to the Siemens 18 MV case

Figure 8: An indication of the variation in neutron dose that exists between operating at 15- and 18-MV modes, and between different linac manufacturers. This data shows MCNPX-calculated neutron doses along the plane of the couch for a Varian 2160C (15 MV and 18 MV) and Siemens Primus (18 MV) (Chibani and Ma 2003). Also shown are several measured data points for the Varian 15 MV. The subplot below the primary figure shows the ratio of these doses to the Siemens 18 MV case