The application of Monte Carlo modelling to downhole total-count logging of uranium

part i - low grade mineralisation

Bruce Dickson*, Geoff Beckitt

*Corresponding author for this work

    Research output: Contribution to journalArticle

    3 Citations (Scopus)


    Gamma-ray logging probes are used extensively within the uranium industry to assist with in situ ore-grade estimates by relating count rates to those obtained from model pits. Correction factors are required to accommodate for the differences between field conditions and the model pits, which are often difficult or even impractical to derive empirically. Gamma-ray transport modelling provides the means to better understand how gamma rays are affected by different logging situations. Corrections for casing, water presence and borehole diameter can be calculated for the relevant probe characteristics such as crystal size and composition, low-energy threshold and probe housing (including shielding). An integral part of correcting gamma probe data is the dead-time and Z-effect correction which can be obtained from logging model pits. Modelling has identified the significance of the low-energy threshold of the detector and the effect of the U grades itself on the correction factors. The proposed method for conversion to equivalent uranium is demonstrated by application to data collected at the Angela deposit in the Northern Territory, Australia.

    Original languageEnglish
    Pages (from-to)56-62
    Number of pages7
    JournalExploration Geophysics
    Issue number1
    Publication statusPublished - 2013


    • Angela
    • gamma ray
    • GEANT
    • logging
    • modelling
    • uranium

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