Background: Caused by the danger of radioactivity

nuclear material identification is sometimes a difficult problem.Purpose: In order to reflect the particle transport processes in nuclear fission and present the effectiveness of the signatures of Nuclear Materials Identification System(NMIS)

based on physical principles and experimental statistical data.Methods: We established a Monte Carlo simulation model of nuclear material identification system and then acquired three channels of time domain pulse signal.Results: Auto-Correlation Functions(AC)

Cross-Correlation Functions(CC)

Auto Power Spectral Densities(APSD) and Cross Power Spectral Densities(CPSD) between channels can obtain several signatures

which can show some characters of nuclear material.Conclusions: The simulation results indicate that the way can help to further study the features of the system.