Working group session report Neutron Beam line Shielding

摘要

Neutron beam lines at spallation neutron sources can present different (and challenging) shielding issues compared to neutron beam liens at fission reactors. neutron beam line shielding is going to become even more important for pulsed spallation neutron sources in the 1-5 MW class that are presently either funded or proposed worldwide. Neutron beam line shielding includes shielding the following: ·beam shutters exterior to the bulk shield; ·collimators; ·T_0-Choppers, frame overlap choppers, etc.; ·experiment-caves; and ·beam stops. Typically each of these neutron beam line components presents a different shielding challenge and requires a different shield composition and thickness.