Table 1.
Material composition showing percentages by weight for the insert materials in the CTP404 phantom. The polystyrene was the same as for the calibration wedge phantom. Water was simulated as G4_Water; that is, H2O with I = 78 eV, with a density of 1.0 g/cm3
| Material | Element (Percentage by weight) | Density (g/cm3) | RSP (He) |
|---|---|---|---|
| Delrin | H (6.7), C (40.0), O (53.3) | 1.420 | 1.373 |
| Polymethylmethacrylate (PMMA) | H (8.1), C (60.0), O (31.9) | 1.190 | 1.174 |
| Polystyrene (G4_Polystyrene) | H (7.74), C (92.26) | 1.060 | 1.043 |
| LDPE (G4_Polyethylene) | H (14.37), C (85.63) | 0.940 | 1.002 |
| Polymethylpentene (PMP) | C (85.6), H (14.4) | 0.830 | 0.887 |
| Teflon (G4_Teflon) | C (24.02), F (75.98) | 2.20 | 1.846 |
| Epoxy | C (71.09), O (19.08), H (7.8), N (2.03) | 1.160 | 1.144 |