Simulation of a Novel Active Interrogation System Using MCNPX

摘要

Results show that the beam current of 4-MeV deuterons required to achieve 1-PD<0.05 per ANSI N42.41 [7] is well below 1 μA for nonhydrogenous cargo loadings, and approximately 20 μA for hydrogenous cargo loadings. Since a large fraction of the signal from the newspaper case is due to photofission from 15.1-MeV gamma rays, increasing beam energy reduces the required current below 10 μA These estimates are conservative since they are based on a surface-averaged flux. Prior knowledge of the location of the SNM would allow alignment of detectors where the peak signal is roughly twice the average.