A comparison of theoretical solutions of the three-layer coaxial diffusionapproximation of the borehole with measurements at the Zielona Gora calibration facility
A. Drabina et al., A comparison of theoretical solutions of the three-layer coaxial diffusionapproximation of the borehole with measurements at the Zielona Gora calibration facility, APPL RAD IS, 54(5), 2001, pp. 849-852
Czubek has obtained a practically successful solution of a two-layer boreho
le geometry using the neutron diffusion approximation. Czubek and Woznicka
solved the more realistic three-layer borehole model, which includes a midd
le layer consisting of mud-cake or steel tubing, in this approximation. The
comparison with experimental data for 15-mm thick steel tubes shows some d
iscrepancies. By using an exact Monte Carlo solution of the Boltzmann equat
ion for calculating the migration length, measurements agree more closely w
ith the "general calibration curve". This opens opportunities for cased bor
ehole logging. (C) 2001 Elsevier Science Ltd. All rights reserved.