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Out-of-field measurements for a 15×15 cm2 18 MV beam in a phantom as a function of distance from the radiation field edge. Bolus thickness: 1 cm, MU: 300 MUs, SSD: 100 cm.
| Distance from field edge (cm) |
Ionization chamber (cGy) |
KCl:Eu2+ (in-field calibration) (cGy) |
Error (cGy) |
|---|---|---|---|
| 10 | 12.96 | 12.25±0.06 | 0.71 |
| 20 | 4.43 | 4.25±0.03 | 0.18 |
| 30 | 1.41 | 1.50±0.02 | 0.09 |
| 40 | 0.59 | 0.75±0.01 | 0.16 |
| 48.5 | 0.29 | 0.41±0.05 | 0.12 |
