The detection and localization of special nuclear materials and other actinides are important in various applications, including nuclear security and radioactive waste management. This system detects the neutrons and gamma rays emitted by actinide materials to localize the sources within a sample. The system's detectors are constructed from organic scintillator cells, enabling rapid detection. When combined with Neutron–Gamma Emission Tomography (NGET), the system allows for precise localization of neutron-emitting sources. This study investigates the attainable spatial resolution of the technique in relation to the dimensions of the individual detector cells, with both experimental measurements and simulations, aiming to optimize detector geometries for various applications and requirements.