A comparison of theoretical solutions of the three-layer coaxial diffusionapproximation of the borehole with measurements at the Zielona Gora calibration facility

Citation
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
Citations number
11
Categorie Soggetti
Multidisciplinary
Journal title
APPLIED RADIATION AND ISOTOPES
ISSN journal
09698043 → ACNP
Volume
54
Issue
5
Year of publication
2001
Pages
849 - 852
Database
ISI
SICI code
0969-8043(200105)54:5<849:ACOTSO>2.0.ZU;2-6
Abstract
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.