The thickness of collimator 3 was reduced from 15.24 cm to 11.23 cm due to available Pb. We simulated this change to see what effect it had. NOTE: This is with collimator 3 in its original position, not moved 5 inches upstream.
Table 1: Background for 15.24 cm and 11.23 cm thick collimator 3, without and with a basic shielding wall (concrete + 2 inch Pb)
| 15.24 cm thick | 11.23 cm thick | 15.24 cm thick w/ wall | 11.23 cm thick w/ wall | |
| Elastic Photons | 0.156310 +/- 0.004970 | 0.174495 +/- 0.005362 | 0.205914 +/- 0.005289 | 0.193518 +/- 0.004997 |
| Inelastic Photons | 0.01564 +/- 0.00049 | 0.01476 +/- 0.00047 | 0.23651 +/- 0.00213 | 0.22897 +/- 0.00207 |
| Inelastic Electrons | 0.07134 +/- 0.00226 | 0.07648 +/- 0.00230 | 0.51148 +/- 0.00789 | 0.49905 +/- 0.00773 |
| Moller Photons | 0.243395 +/- 0.011738 | 0.283988 +/- 0.013493 | 0.193534 +/- 0.011671 | 0.159545 +/- 0.009552 |
| Moller Electrons | 0.734129 +/- 0.042743 | 0.747627 +/- 0.044131 | 0.156575 +/- 0.020214 | 0.143294 +/- 0.018980 |