A New NMIS Characteristic Signature Acquisition Method Based on Time-Domain Fission Correlation Spectrum

To deal with the disadvantages of the homogeneous signature of the nuclear material identification system（NMIS） and limited methods to extract the characteristic parameters of the nuclear materials, an enhanced method using the combination of the Time-of-Flight（TOF） and the Pulse Shape Discrimination（PSD） was introduced into the traditional characteristic parameters extraction and recognition system of the NMIS. With the help of the PSD, the γ signal and the neutron signal can be discriminated. Further based on the differences of the neutron-γ flight time of the detectors in various positions, a new timedomain signature reflecting the position information of unknown nuclear material was investigated. The simulation result showed that the algorithm is feasible and helpful to identify the relative position of unknown nuclear material.