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Calculated values for the estimation of the number of photons required by simulations according to the Monte Carlo and measurements method.
| Beam peak voltage
(kVp) |
|||
|---|---|---|---|
| 50 | 70 | 80 | |
| Exposure reading (μC/kg air) | 7.38 | 6.34 | 6.26 |
| Measured dose in air (mGy) | 0.250 | 0.215 | 0.212 |
| Simulated dose in air for 109 photons (μGy) | 8.7 | 5.9 | 5.3 |
| Calibration factor (1011 photons/mA s) | 1.15 | 1.45 | 1.62 |
| Relative difference with line 5, Table III | 6% | 9% | 12% |
