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Experimental evaluation of epithermal neutron self-shielding for 96Zr and 98Mo

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Abstract
In a previous work we experimentally tested some neutron self-shielding calculations methods for thermal absorbers, from which the semi-empirical "sigmoid method" gave the most accurate results. In this work we aim at evaluating the accuracy of this method on the epithermal self-shielding phenomena as compared to the analytical "MatSSF method". Metallic foils of Zr and Mo were compactly stacked together into small cylinders (or disks) of different thickness, allowing for up to 20 % epithermal self-shielding when irradiated on two channels of the BR1 reactor. A 2 % relative difference between calculated and experimental self-shielding factors was obtained from the MatSSF method when a perpendicular source-sample axial configuration was assumed, while the isotropic or the co-axial configuration alternatives gave up to 10 % relative differences. On the other hand, the sigmoid method gave relative differences of up to 6 % that can be reduced to just 2 % by applying the "effective" epithermal absorption cross-sections for Mo-98 and Zr-96 proposed in this work.
Keywords
Bell factor, Resonances, Neutron self-shielding, MatSSF method, Effective epithermal absorption cross-sections, Sigmoid method, Neutron absorption

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Chicago
Farina, Fulvio, Peter Vermaercke, Leen Verheyen, and Karel Strijckmans. 2013. “Experimental Evaluation of Epithermal Neutron Self-shielding for 96Zr and 98Mo.” Journal of Radioanalytical and Nuclear Chemistry 297 (3): 371–375.
APA
Farina, Fulvio, Vermaercke, P., Verheyen, L., & Strijckmans, K. (2013). Experimental evaluation of epithermal neutron self-shielding for 96Zr and 98Mo. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 297(3), 371–375. Presented at the 10th International conference on Nuclear Analytical Methods in the Life Science.
Vancouver
1.
Farina F, Vermaercke P, Verheyen L, Strijckmans K. Experimental evaluation of epithermal neutron self-shielding for 96Zr and 98Mo. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY. 2013;297(3):371–5.
MLA
Farina, Fulvio, Peter Vermaercke, Leen Verheyen, et al. “Experimental Evaluation of Epithermal Neutron Self-shielding for 96Zr and 98Mo.” JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 297.3 (2013): 371–375. Print.
@article{3078973,
  abstract     = {In a previous work we experimentally tested some neutron self-shielding calculations methods for thermal absorbers, from which the semi-empirical {\textacutedbl}sigmoid method{\textacutedbl} gave the most accurate results. In this work we aim at evaluating the accuracy of this method on the epithermal self-shielding phenomena as compared to the analytical {\textacutedbl}MatSSF method{\textacutedbl}. Metallic foils of Zr and Mo were compactly stacked together into small cylinders (or disks) of different thickness, allowing for up to 20 \% epithermal self-shielding when irradiated on two channels of the BR1 reactor. A 2 \% relative difference between calculated and experimental self-shielding factors was obtained from the MatSSF method when a perpendicular source-sample axial configuration was assumed, while the isotropic or the co-axial configuration alternatives gave up to 10 \% relative differences. On the other hand, the sigmoid method gave relative differences of up to 6 \% that can be reduced to just 2 \% by applying the {\textacutedbl}effective{\textacutedbl} epithermal absorption cross-sections for Mo-98 and Zr-96 proposed in this work.},
  author       = {Farina, Fulvio and Vermaercke, Peter and Verheyen, Leen and Strijckmans, Karel},
  issn         = {0236-5731},
  journal      = {JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY},
  keyword      = {Bell factor,Resonances,Neutron self-shielding,MatSSF method,Effective epithermal absorption cross-sections,Sigmoid method,Neutron absorption},
  language     = {eng},
  location     = {Bangkok, Thailand},
  number       = {3},
  pages        = {371--375},
  title        = {Experimental evaluation of epithermal neutron self-shielding for 96Zr and 98Mo},
  url          = {http://dx.doi.org/10.1007/s10967-012-2363-0},
  volume       = {297},
  year         = {2013},
}

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