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Figure 11: (a) The percentage contribution of patient-scatter to out-of-field dose for a range of field sizes from a 60Co unit (Theratron 780) (Van der Giessen and Hurkmans, 1993).[30] (b) The contribution of collimator scatter and head leakage (as a percentage) to out-of-field dose for a range of field sizes from a 6-MV treatment beam (GE Saturne 41) (Van der Giessen, 1994)[31]

Figure 11: (a) The percentage contribution of patient-scatter to out-of-field dose for a range of field sizes from a 60Co unit (Theratron 780) (Van der Giessen and Hurkmans, 1993).<sup>[30]</sup> (b) The contribution of collimator scatter and head leakage (as a percentage) to out-of-field dose for a range of field sizes from a 6-MV treatment beam (GE Saturne 41) (Van der Giessen, 1994)<sup>[31]</sup>