  The absorption of neutrons in media together with its transport properties
cause the neutron flux to decrease as it penetrates the material because the
absorption of neutrons in the sample itself attenuates the neutrons flux as it
goes deeper into the sample. In the present work, the thermal neutron
self-shielding factors of indium, gold, zinc, and mercury were determined
experimentally. The current results together with those found in the literature
were used to validate a mathematical ab initio formulae based on integral
cross-section parameters used to compare our results. The complete agreement
among these species of data suggests the validity of correlating the neutron
migration length in the convex-shaped material with the average chord length
described in the mathematical model.
