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Limited dose averaging factor (LDAF) obtained from the ratio of the average PISD calculated using PPBS lateral relative dose profiles along the two principal axes and those at different angles measured using Kodak XV film at 2 cm depth.
| Energy of PPBS (MeV) | LDAF |
|---|---|
| 72.5 | 0.99 |
| 89.6 | 1.00 |
| 146.9 | 0.99 |
| 181.1 | 1.01 |
| 221.8 | 0.99 |
