Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
The dose evaluation parameters of 7LiF in the thickness range of 22–36 cm
| 7LiF thickness (cm) | ADDR (Gy-eq) | Depth of ADDR (cm) | Max dose rate of tumor (Gy-eq) | Advantage depth (cm) | Therapeutic gain (TG) | Treatment time (min) | Max dose rate of tumor (Gy-eq) |
|---|---|---|---|---|---|---|---|
| 22 | 61.1 | 0 | 157 | 8.2 | 1.95 | 12.3 | 33.0 |
| 24 | 42.8 | 0.4 | 135 | 8.8 | 2.21 | 17.5 | 40.5 |
| 26 | 33.2 | 0.4 | 115 | 9.0 | 2.46 | 22.6 | 43.7 |
| 28 | 25.9 | 2 | 99 | 9.2 | 2.61 | 29.0 | 48.5 |
| 30 | 21.7 | 2.4 | 85 | 9.2 | 2.66 | 34.6 | 49.3 |
| 32 | 18.3 | 2.4 | 73 | 9.2 | 2.68 | 41.4 | 50.4 |
| 34 | 15.5 | 2.4 | 63 | 9.2 | 2.70 | 48.6 | 51.0 |
| 36 | 13.2 | 2.4 | 54 | 9.2 | 2.72 | 57.0 | 51.3 |
The IAEA parameters [14] obtained by using 0_8 cm thick Pb and Bi as gamma filters, respectively, where the thickness of 7LiF is 30 cm
| Parameter | φepi (n/cm−2·s−1) | φth/φepi | Df/φepi (Gy-cm2/n) | Dγ/φepi (Gy-cm2/n) | Current/flux |
|---|---|---|---|---|---|
| IAEA advised | >1.00 × 109 | <0.05 | <2.00 × 10−13 | <2.00 × 10−13 | >0.70 |
| Pb 0.8 cm | 1.82 × 109 | 0.005 | 4.22 × 10−14 | 3.31 × 10−14 | 0.71 |
| Bi 0.8 cm | 1.84 × 109 | 0.005 | 4.21 × 10−14 | 3.30 × 10−14 | 0.71 |
The dose evaluation parameters of MgF2 in the thickness range of 22–36 cm
| MgF2 thickness (cm) | ADDR (Gy-eq) | Depth of ADDR (cm) | Max dose rate of tumor (Gy-eq) | Advantage depth (cm) | Therapeutic gain (TG) | Treatment time (min) | Max dose rate of tumor (Gy-eq) |
|---|---|---|---|---|---|---|---|
| 22 | 64.1 | 0 | 152 | 8.0 | 1.81 | 12.0 | 32.4 |
| 24 | 47.6 | 0 | 131 | 8.4 | 2.00 | 16.2 | 35.3 |
| 26 | 34.2 | 0 | 109 | 8.8 | 2.28 | 22.2 | 40.6 |
| 28 | 25.8 | 2 | 95 | 9.2 | 2.50 | 29.4 | 46.6 |
| 30 | 20.9 | 2 | 80 | 9.2 | 2.63 | 36.0 | 48.3 |
| 32 | 17.8 | 2.4 | 69 | 9.2 | 2.63 | 42.6 | 48.8 |
| 34 | 15.1 | 2.4 | 59 | 9.2 | 2.63 | 49.8 | 49.3 |
| 36 | 12.9 | 2.4 | 51 | 9.2 | 2.63 | 58.2 | 49.3 |