Conceptual design for a new heterogeneous 241Am-9Be neutron source assembly using SOURCES4C-MCNPX hybrid simulations

N. Ghal-Eh, F. Rahmani, S. V. Bedenko

Research output: Contribution to journalArticle

Abstract

In this study, an approach to simulate a novel variable-yield heterogeneous 241Am-9Be was proposed with a hybrid use of SOURCES4C and MCNPX codes, and its energy spectrum and neutron emission yield were simulated. In these simulations, the energy spectra of the alpha particles emitted from the americium source and the neutrons produced within the beryllium and oxygen contents as a result of 9Be(α,n) and 17,18O(α,n) reactions were calculated with SOURCES4C whilst the neutron transport from neutron production points to the space outside the source assembly were performed with the MCNPX code. The neutron energy spectrum and neutron emission yield for two different configurations of single-rod and multi-rod sources (i.e., americium or americium oxide rods in beryllium medium) were compared to a source of homogeneous americium (or its oxides) and beryllium mixture. The proposed heterogeneous geometry was aimed to provide a neutron source with a variable neutron yield, easy-to-shut down and easy-to-waste process features. The results confirmed that the homogeneous source represented the largest neutron yield compared to single- and multi-rod geometries. However, the neutron yield in heterogenous geometry could be altered by varying the number of americium (or americium oxide) rods to reach the desired neutron yield.

Original languageEnglish
Article number108811
JournalApplied Radiation and Isotopes
Volume153
DOIs
Publication statusPublished - 1 Nov 2019

Fingerprint

americium
neutron sources
assembly
rods
neutrons
beryllium
simulation
energy spectra
neutron emission
oxides
geometry
neutron spectra
alpha particles
oxygen
configurations

Keywords

  • Am-Be
  • Energy spectrum
  • MCNPX
  • Neutron source assembly
  • Neutron yield
  • SOURCES4C

ASJC Scopus subject areas

  • Radiation

Cite this

Conceptual design for a new heterogeneous 241Am-9Be neutron source assembly using SOURCES4C-MCNPX hybrid simulations. / Ghal-Eh, N.; Rahmani, F.; Bedenko, S. V.

In: Applied Radiation and Isotopes, Vol. 153, 108811, 01.11.2019.

Research output: Contribution to journalArticle

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