An integrated neutron-gamma radiation detector includes a gamma sensing element, a neutron sensing element comprising a neutron scintillating material at least partially surrounded by an optical waveguide material, and a photosensing element optically coupled to both the gamma sensing element and the neutron sensing element. Clusters of semantically scored documents are placed in a three-dimensional scene and are arranged as a cluster spine. The hub assemblies and disk may be bonded together using a UV curable adhesive.