Table 1.
The reflection coefficient of photons for ordinary concrete as a function of reflected angles calculated using the FLUKA code (wall-reflection coefficient).
| Energy (MeV) | Angle of reflection or scatter (degrees) from surface of concrete | |||||
|---|---|---|---|---|---|---|
| 92 | 105 | 120 | 135 | 150 | 165 | |
| 0.25 | 1.21 | 10.49 | 18.02 | 23.01 | 26.29 | 28.03 |
| 0.5 | 0.80 | 7.24 | 12.11 | 15.03 | 16.74 | 17.54 |
| 0.662 | 0.66 | 5.99 | 9.95 | 12.29 | 13.56 | 14.12 |
| 1 | 0.45 | 4.15 | 6.83 | 8.33 | 9.14 | 9.45 |
| 1.25 | 0.37 | 3.47 | 5.68 | 6.91 | 7.57 | 7.82 |
| 2 | 0.25 | 2.43 | 4.00 | 4.89 | 5.36 | 5.55 |
| 3 | 0.19 | 1.92 | 3.24 | 4.02 | 4.49 | 4.65 |
| 5 | 0.14 | 1.58 | 2.79 | 3.58 | 4.04 | 4.23 |
| 7 | 0.11 | 1.43 | 2.62 | 3.40 | 3.85 | 4.06 |
| 10 | 0.09 | 1.29 | 2.45 | 3.23 | 3.69 | 3.88 |
| 20 | 0.07 | 0.98 | 1.99 | 2.70 | 3.11 | 3.32 |
Multiply each table entry by 10–3 (e.g., the entry 5.39 means 5.39 × 10–3) with electrons cut-off = 100 keV and photons cut-off = 1 keV.
The statistical uncertainties are within ± 4% (95% confidence limit).