Figure 1
From: General considerations for effective thermal neutron shielding in detector applications
Top view of a general neutron detector, displaying the background neutrons together with the shielding configuration designed to attenuate them. In the figure, the vessel (dark grey) and active detector volume (light grey) are presented together with different categories of shielding (interstack, external, end and side shielding). The numbers associated with the arrows highlight the different types of backgrounds and include: (1) external background, (2) scattering in the vessel, (3) scattering in the active volume and (4) scattering of the shielding materials