Radiological design study of First Optics Enclosure against secondary gas bremsstrahlung for the Canadian Light Source

The design study of the First Optics Enclosure (FOE) against radiation due to secondary gas bremsstrahlung is performed for the beamlines at the Canadian Light Source. The back wall, side walls and roof of the FOE are made of lead. Placed in the FOE are a thin copper metal as a source of secondary gas bremsstrahlung and a tungsten beam shutter/stop. The energy deposition in the water phantom which surrounds the FOE is estimated by the Monte Carlo simulation. The thickness of lead shielding walls of the FOE is studied.