Table 2.
Brass thickness (mm) | Plastic thickness (mm) | Total collimator thickness (mm) | Collimator-related peak neutron dose (pGy/incident proton) |
---|---|---|---|
65 | 0 | 65 | 0.36 |
55 | 25 | 80 | 0.29 |
50 | 41 | 91 | 0.25 |
45 | 59 | 104 | 0.22 |
40 | 75 | 115 | 0.20 |
35 | 94 | 129 | 0.18 |
25 | 128 | 153 | 0.17 |
0 | 195 | 195 | 0.16 |