Title: Monte Carlo Determined Self-Shielded Groupwise Cross-Sections for the Activation Foil Stack Applied in the Epithermal Neutron Spectrum Adjustment
Authors: LIU Yuan-HaoNIEVAART Victor AlexanderLIU Hong-MingMOSS RaymondJIANG Shiang-Huei
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP vol. 602 no. 2 p. 557-563
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2009
JRC Publication N°: JRC48381
ISSN: 0168-9002
URI: http://www.elsevier.com/locate/nima
http://publications.jrc.ec.europa.eu/repository/handle/JRC48381
DOI: 10.1016/j.nima.2009.01.008
Type: Articles in Journals
Abstract: Activation foils, stacked in a package, together with a spectrum adjustment code are generally the means to characterize the neutron spectrum of a BNCT epithermal neutron beam. When using foil stacks, the phenomenon of neutron scattering is appreciably enhanced, especially in an epithermal neutron beam, as compared to a thermal neutron field. Contrary to the conventional idea of the self-shielding effect, self-shielding correction factors in most of the foils in the stack are larger than one. This paper demonstrates a way to correct the complex self-shielding effect using groupwise cross-sections adjusted for self-shielding, as calculated by the Monte Carlo neutron transport code, MCNP. This methodology can solve the perturbation problems caused by the foil stack applied in an epithermal neutron beam. In this study, the adjusted spectrum of the HB11 epithermal neutron beam, dedicated for BNCT research in at Petten in The Netherlands, is utilized and two adjusted spectra are presented with and without the self-shielding correction. The difference between the spectra is highly significant and demonstrates that the self-shielding correction cannot be ignored.
JRC Institute:Institute for Energy and Transport

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