Customized Multi-Group Cross Section Generation with NJOY for Discrete Ordinates X-Ray Computed Tomography and Radiography Simulation


The purpose of this work was to explore the creation of photoatomic multi-group cross section libraries to be used with a software package DOCTORS (Discrete Ordinates Computed TOmography and Radiography Simulator) [1]. This software solves the linear Boltzmann equation using the discrete ordinates method. To create these libraries, NJOY2016 was used, creating both fine and broad energy multi-group cross section files. The cross section's accuracy was tested against an equivalent Monte Carlo simulation using MCNP6. Two simulation geometries were used. The first, a cylindrical water phantom with a single source projection placed in front, simulating an X-ray radiography. The second used the same water phantom with 16 cone beam sources placed evenly around the phantom to simulate a computed tomography (CT) scan. The accuracy of the fine energy multi-group cross sections when used in DOCTORS has been verified. The accuracy of the broad energy multigroup cross sections when used in DOCTORS shows that more work must be done before they can be used reliably.

Meeting Name

20th Topical Meeting of the Radiation Protection and Shielding Division, RPSD 2018 (2018: Aug. 26-31, Santa Fe, NM)


Nuclear Engineering and Radiation Science

Keywords and Phrases

Boltzmann equation; Computer software; Computerized tomography; Intelligent systems; Libraries; Monte Carlo methods; Phantoms; Radiation shielding; X rays, Computed tomography scan; Cross section generation; Cross-section library; Discrete ordinates method; Linear Boltzmann equation; Multigroup cross sections; Radiography simulations; X-ray computed tomography, X ray radiography

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Document Type

Article - Conference proceedings

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© 2018 American Nuclear Society (ANS), All rights reserved.

Publication Date

01 Aug 2018

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