Table 2.
Relative contribution of fluorescence to the stem effect light for different irradiation modalities, energies, and depths in the phantom.
| Linear accelerator | |||||
|---|---|---|---|---|---|
| 0cm | 1cm | 2cm | 3cm | 0cm, 45deg | |
| 6 MV | (4.03 ± 0.14)% | (3.51 ± 0.07)% | (3.45 ± 0.02)% | (3.51 ± 0.08)% | (1.37 ± 1.24)% |
| 15 MV | (3.22 ± 0.11)% | (3.10 ± 0.06)% | (3.01 ± 0.05)% | (3.00 ± 0.04)% | (1.10 ± 1.14)% |
| 5 MeV | (6.42 ± 0.55)% | (2.43 ± 0.03)% | (2.70 ± 0.06)% | (2.61 ± 0.17)% | (0.14 ± 0.02)% |
| 7 MeV | (6.42 ± 0.14)% | (3.21 ± 0.04)% | (2.33 ± 0.02)% | (2.79 ± 0.08)% | (0.04 ± 0.01)% |
| 8 MeV | (6.23 ± 0.12)% | (3.86 ± 0.20)% | (2.54 ± 0.03)% | (2.37 ± 0.08)% | (0.04 ± 0.01)% |
| 10 MeV | (6.43 ± 0.14)% | (4.39 ± 0.13)% | (2.84 ± 0.04)% | (2.32 ± 0.06)% | (0.04 ± 0.01)% |
| 12 MeV | (5.74 ± 0.07)% | (4.66 ± 0.14)% | (3.54 ± 0.04)% | (2.58 ± 0.04)% | (0.00 ± 0.01)% |
| 15 MeV | (5.09 ± 0.02)% | (4.52 ± 0.17)% | (3.86 ± 0.02)% | (3.05 ± 0.06)% | (0.00 ± 0.00)% |
| Cobalt-60 | Superficial therapy | Ir-192 | |||
|---|---|---|---|---|---|
| 0 cm | (5.65 ± 0.73)% | 75 kVp | (100.00 ± 2.09)% | 1 cm | (24.60 ± 2.37)% |
| 1 cm | (5.88 ± 0.22)% | 125 kVp | (98.99 ± 2.28)% | 2 cm | (22.74 ± 1.66)% |
| 2 cm | (5.80 ± 0.10)% | 250 kVp | (98.28 ± 0.42)% | 3 cm | (24.88 ± 3.05)% |
| 0 cm, 45° | (2.67 ± 0.04)% | 250 kVp, 45° | (97.69 ± 0.50)% | 5 cm | (28.71 ± 4.96)% |
| 2 cm, 45° | (2.93 ± 0.12)% | 3 cm, 90° | (23.95 ± 3.98)% | ||