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The characteristics of parallel‐plate chamber 2 used in this study.
| Entrance window | |||
|---|---|---|---|
| Ionization chamber | Material | Thickness (g/cm2) | Waterproof (Y/N) |
| PTW 34045 | Graphite, polyethylene | 0.102 | Y |
| PTW 34001 | PMMA, graphite | 0.118 | Y |
| IBA PPC‐40 | PMMA, graphite | 0.118 | Y |
