Abstract
In order to correct for neutron self-shielding in large-sample prompt gamma NAA, a method has been developed to determine the macroscopic scattering and absorption cross sections, i.e., Σ a and Σ s, using four Cu flux monitors placed around the sample. With Monte Carlo computations, the neutron densities throughout the sample and the resulting and the corresponding self-shielding factor as calculated from the Σ a and Σ s as obtained through the Cu monitors were compared to the true values. The derived Σ a and Σ s were found to be sufficiently accurate as long as Σ t = Σ a + Σ s was less than 0.6 cm−1 and Σ s/Σ t was greater than 0.1.
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Blaauw, M., Degenaar, I.H. & de Goeij, J.J.M. Development of a non-invasive method for the determination of the macroscopic neutron cross sections of a sample matrix in large-sample prompt-gamma neutron activation analysis. J Radioanal Nucl Chem 271, 765–770 (2007). https://doi.org/10.1007/s10967-007-0339-2
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DOI: https://doi.org/10.1007/s10967-007-0339-2