摘要: Three-dimensional (3-d) radiation transport simulations have been performed todefine the shielding requirements of a generic neutron beam line and generic T(sub 0), E(sub 0) and bandwidth choppers for the Spallation Neutron Source... 展开 Three-dimensional (3-d) radiation transport simulations have been performed todefine the shielding requirements of a generic neutron beam line and generic T(sub 0), E(sub 0) and bandwidth choppers for the Spallation Neutron Source (SNS). In these analyses, the beam line and chopper models were located between 5 m and 10 m from the moderator face, at their closest likely positions relative to the moderator. From these calculations the maximum required shielding is determined for each chopper. 收起