High Detection Efficiency, Solid State MicroFiber Neutron Detector

The movement of nuclear materials requires improved detection capabilities for identification and location. More efficient neutron detectors are needed to detect fast neutrons, while also discriminating a neutron event from that of a gamma event. This project will develop a simplified solid-state neutron detector, based upon electron-amplifying microfibers formed into a solid plate. Because of the unique geometry and combination of materials, the detector will exhibit exceptionally high detection efficiencies in a compact size at much lower costs, provide for reduced gamma sensitivity along with minimum self shielding, and enable small compact detectors for nuclear materials identification. Phase I will develop the fiber compositions, draw fiber, and then assemble and test prototypes of the microfiber detector. The system will be tested first in the laboratory with electron, gamma, and alpha sources, followed by tests with fast neutron sources. The results will be compared to the performance of conventional detectors. Phase II will further optimize the configuration and construct fully functional detector hardware for laboratory evaluation. Then, the detector hardware will be packaged with proper shielding, along with the requisite electronics and software, leading to a full sequence of field testing. Commercial Applications and other Benefits as described by the awardee: Highly efficient, low-cost neutron-sensitive detectors should receive widespread distribution to government workers potentially interacting with nuclear radioisotopes. A small, hand-held detector could be commercially distributed to ustoms, post office, police, first responders, and military personnel. Obviously, the prevention of a single nuclear event due to terrorism or from movement of clandestine materials would be both politically and economically of great importance.