Neutron Transport Models and Methods for HZETRN and Coupling to Low Energy Light Ion Transport

Event
International Conference On Environmental Systems
Authors Abstract
Content
Exposure estimates inside space vehicles, surface habitats, and high altitude aircraft exposed to space radiation are highly influenced by secondary neutron production. The deterministic transport code HZETRN has been identified as a reliable and efficient tool for such studies, but improvements to the underlying transport models and numerical methods are still necessary. In this paper, the forward-backward (FB) and directionally coupled forward-backward (DC) neutron transport models are derived, numerical methods for the FB model are reviewed, and a computationally efficient numerical solution is presented for the DC model. Both models are compared to the Monte Carlo codes HETC-HEDS and FLUKA, and the DC model is shown to agree closely with the Monte Carlo results. Finally, it is found in the development of either model that the decoupling of low energy neutrons from the light ion (A≤4) transport procedure adversely affects low energy light ion fluence spectra and exposure quantities. A first order correction is presented to resolve the problem, and it is shown to be both accurate and efficient.
Meta TagsDetails
DOI
https://doi.org/10.4271/2008-01-2162
Pages
12
Citation
Slaba, T., Heinbockel, J., and Blattnig, S., "Neutron Transport Models and Methods for HZETRN and Coupling to Low Energy Light Ion Transport," SAE Int. J. Aerosp. 1(1):510-521, 2009, https://doi.org/10.4271/2008-01-2162.
Additional Details
Publisher
Published
Jun 29, 2008
Product Code
2008-01-2162
Content Type
Journal Article
Language
English