@inproceedings{11f2ade9d6a44cf8b5779b7488f6439d,

title = "Development and application of a hybrid transport methodology for active interrogation systems",

abstract = "A hybrid Monte Carlo and deterministic methodology has been developed for application to active interrogation systems. The methodology consists of four steps: i) neutron flux distribution due to neutron source transport and subcritical multiplication; ii) generation of gamma source distribution from (n, 7) interactions; iii) determination of gamma current at a detector window; iv) detection of gammas by the detector. This paper discusses the theory and results of the first three steps for the case of a cargo container with a sphere of HEU in third-density water cargo. To complete the first step, a response-function formulation has been developed to calculate the subcritical multiplication and neutron flux distribution. Response coefficients are pre-calculated using the MCNP5 Monte Carlo code. The second step uses the calculated neutron flux distribution and Bugle-96 (n, 7) cross sections to find the resulting gamma source distribution. In the third step the gamma source distribution is coupled with a pre-calculated adjoint function to determine the gamma current at a detector window. The AIMS (Active Interrogation for Monitoring Special-Nuclear-Materials) software has been written to output the gamma current for a source-detector assembly scanning across a cargo container using the pre-calculated values and taking significantly less time than a reference MCNP5 calculation.",

keywords = "Active interrogation, Adjoint function, Deterministic, Monte Carlo",

author = "Katherine Royston and William Walters and Alireza Haghighat and Ce Yi and Glenn Sjoden",

year = "2013",

language = "English",

isbn = "9781627486439",

series = "International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2013",

pages = "761--775",

booktitle = "International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2013",

note = "International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2013 ; Conference date: 05-05-2013 Through 09-05-2013",

}