Table 1.
Dose Rate on Central Axis of the Field at Varying Depths in the Solid-Water Phantom Measured by EBT3 Film for 10 Collimators.
| Dose Rate on Central Axis, cGy/min |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Square Collimators, mm2 |
Circular Collimators, Diameter in mm |
|||||||||
| Depth, mm | 10 × 10 | 20 × 20 | 40 × 40 | ϕ1 | ϕ2.5 | ϕ3.5 | ϕ5 | ϕ10 | ϕ15 | ϕ25 |
| 1 | 324.5 | 339.2 | 364.6 | 177.8 | 239.8 | 236.9 | 310.2 | 320.9 | 329.8 | 344.5 |
| 5 | 309.7 | 323.7 | 360.2 | 169.9 | 225.7 | 222.2 | 285.4 | 305.3 | 321.2 | 328.5 |
| 10 | 291.2 | 310.3 | 341.1 | 162.0 | 208.7 | 207.3 | 269.1 | 285.4 | 291.7 | 315.4 |
| 20 | 240.0 | 273.2 | 309.8 | 128.6 | 173.1 | 171.6 | 216.6 | 236.2 | 251.2 | 271.1 |
| 30 | 205.5 | 226.1 | 273.7 | 103.7 | 144.6 | 147.4 | 180.0 | 200.1 | 209.2 | 239.5 |
| 40 | 170.5 | 192.2 | 235.5 | 90.5 | 118.2 | 121.1 | 154.1 | 163.8 | 179.5 | 197.9 |
| 50 | 141.5 | 174.0 | 198.8 | 73.9 | 103.4 | 98.3 | 126.1 | 139.6 | 153.3 | 170.7 |