Radiation levels around the Fermilab Main Injector extraction septa

The Fermilab Main Injector extraction system will be capable of delivering a uniform 120 GeV beam of ~3×10¹³ protons per spill to the fixed target experiments (with spill time of 1 sec). Up to 2% of the beam is expected to be lost at the extraction septum and the Lambertson magnet. As a result, one expects increased radiation levels around the septa compared to other parts of the Main Injector. Realistic Monte-Carlo simulations have been performed to estimate the instantaneous and residual radiation levels in the beam extraction region. The results of these studies are presented and implications are discussed