Table 1.
Survival parameters and RBE values for normal human fibroblasts irradiated in a pristine 60-MeV proton beam near its Bragg peak
| Irradiation | α (Gy−1) | β (Gy−2) | SF2 | RBE SF = 0.37 |
RBE SF = 0.1 |
RBE SF = 0.01 |
|---|---|---|---|---|---|---|
| HFIB 2 | ||||||
| 6-MV X-rays | 0.689 ± 0.164 | 0.041 ± 0.015 | 0.21 ± 0.05 | |||
| Pristine Bragg peak | 0.855 ± 0.252 | 0.040 ± 0.047 | 0.15 ± 0.05 | 1.21 ± 0.05 | 1.19 ± 0.05 | 1.15 ± 0.09 |
| HFIB 15 | ||||||
| 6-MV X-rays | 0.627 ± 0.028 | 0.048 ± 0.014 | 0.22 ± 0.04 | |||
| Pristine Bragg peak | 0.630 ± 0.033 | 0.062 ± 0.005 | 0.25 ± 0.05 | 1.03 ± 0.04 | 1.05 ± 0.03 | 1.06 ± 0.04 |
| HFIB 30 | ||||||
| 6-MV X-rays | 0.718 ± 0.217 | 0.058 ± 0.017 | 0.24 ± 0.17 | |||
| Pristine Bragg peak | 0.814 ± 0.141 | 0.056 ± 0.041 | 0.16 ± 0.08 | 1.16 ± 0.29 | 1.14 ± 0.30 | 1.11 ± 0.33 |
Listed are mean values ± SD from 4 to 5 independent experiments