Table 3.
Recommended deviation values for different regions of the electron beam [14]
| Region designation | Type and location of the region | Deviation value for simple geometry, homogeneous environment |
|---|---|---|
| δ1 | High dose, small dose gradient Central axis of the radiation beam |
2.0% |
| δ2 | High dose, large dose gradient Dose drop area in the central axis, penumbra region |
10.0% |
| δ3 | High dose, small dose gradient Outside the central axis of the radiation beam |
3.0% |
| δ4 | Low dose, small dose gradient Region beyond the beam boundary |
3.0% |