The solution to the one-energy-group diffusion equation for the case of a point neutron source on the axis of two concentric cylindrical media has been programmed for a digital computer. Numerical results for a wide range of values of diffusion length and diffusion coefficient for the outer medium, and for four radii of the inner cylinder are presented. The outer radius in all cases is effectively infinite.
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Allen, L. S. and Tittle, C. W.
"Some Functions in the Theory of Neutron Logging,"
Journal of the Graduate Research Center: Vol. 33:
1, Article 6.
Available at: https://scholar.smu.edu/journal_grc/vol33/iss1/6