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The characteristics of cylindrical chamber 2 used in this study.
| Cavity wall | ||||
|---|---|---|---|---|
| Ionization chamber | Material | Thickness (g/cm2) | Cavity volume (cm3) | Waterproof (Y/N) |
| PTW 30013 | PMMA | 0.057 | 0.6 | Y |
| IBA FC65‐G | Graphite | 0.073 | 0.65 | Y |
| IBA FC65‐P | Polyoxymethylene | 0.057 | 0.65 | Y |
