Field side (cm)
Conversion factor of surface dose to maximum dose 
(SD)
5
8.42
0.94
10
5.94
0.52
15
4.88
0.37
20
3.69
0.24
| Field side (cm) | Conversion factor of surface dose to maximum dose | (SD) |
| 5 | 8.42 | 0.94 |
| 10 | 5.94 | 0.52 |
| 15 | 4.88 | 0.37 |
| 20 | 3.69 | 0.24 |