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An assessment of the effect of inter-field dose contamination when measuring Sc, p in the field geometry in figure 1(a). The ‘combined geometry’ is shown in figure 1(a). The ‘separate geometry’ refers to the irradiation of one piece of film per field
| Field size (mm) | EBT (combined geometry) | EBT (separate geometry) | Percent error |
|---|---|---|---|
| 30 × 30 | 0.901 ± 0.018 | 0.892 ± 0.018 | 1.0% |
| 20 × 20 | 0.899 ± 0.018 | 0.886 ± 0.018 | 1.5% |
| 10 × 10 | 0.802 ± 0.016 | 0.795 ± 0.016 | 0.8% |
| 5 × 5 | 0.642 ± 0.013 | 0.636 ± 0.013 | 0.7% |
