| Influence quantity | Reference values or reference characteristics | |
| Particle type | Protons | Carbon ions |
| Quality beam | Residual range | Residual range |
| Phantom | water | water |
| SSD | clinical treatment distance | clinical treatment distance |
| Field size | 10 cm × 10 cm | 10 cm × 10 cm |
| Reference dosimeter | IC thimble or PPC | IC thimble or PP |
| Ionization Chamber (IC) or Plan Paralel Chamber (PPC) type | for Rres ≥ 0.5 g∙cm2, IC thimble or PPC for Rres < 0.5 g∙cm2, PPC | for SOBP width ≥ 2 g∙cm2, IC or PP for SOBP width < 2 g∙cm2, PP |
| Measurement depth, zref | middle of the SOBP/plateau | middle of the SOBP/plateau |
| Calibration quality, Qo | Co-60 beam | Co-60 beam |
| IC calibration factor | ND,w-TRS 398 NX, NK, ND,w-ICRU59 | ND,w-TRS398
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