Numerical estimation of real and apparent integral neutron parameters used in nuclear borehole geophysics.
The semi-empirical method of neutron logging tool calibration developed by Prof. J.A. Czubek uses the real and so-called apparent integral neutron parameters of geological formations. To this end, Czubek proposed a few separated calculation methods commonly based on analytical solutions of the neutron transport problem. A new calculation method for the neutron integral parameters is proposed. Quantities like slowing-down length, diffusion and migration lengths, probability to avoid absorption during slowing down, and thermal neutron absorption cross section can be easily approximated using Monte Carlo simulations. A comparison with the results of the analytical method developed by Czubek has been performed for many cases and the observed differences have been explained.
Dworak
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H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Krakow, Poland.
Drabina
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Woźnicka
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