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CX-005191: Categorical Exclusion Determination

Radiation Portal Monitor
CX(s) Applied: B2.2
Date: 01/31/2011
Location(s): Menlo Park, California
Office(s): Stanford Linear Accelerator Site Office

SLAC National Accelerator Laboratory has a long-term schedule for the disassembly and disposition (D&D) of metal objects released for offsite disposal from the SLAC B-Factory Detector (BaBar) and the upgraded SLAC positron-electron collider (PEP-II) experiments. As part of this effort, SLAC is proposing to install and operate a radiation portal monitor (RPM) to measure high-energy gamma radioisotopes of trucks transporting metals offsite. The proposed structure comprises two upright columns, one on either side of a turnout lane along the road toward SLAC?s south gate at Alpine Road. Vehicles exiting the site will be directed to drive between the columns to have their cargo surveyed. The RPM will provide additional verification that no radioactive metals are leaving the site. This verification is a supplement to normal site radiation survey procedures and protocols for offsite removal of materials used in research at SLAC.