Correcting aerial gamma-ray survey data for aircraft altitude

Maurice Craig, Bruce Dickson, Stewart Rodrigues

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    In their ascent to the aircraft detector system, the gamma-rays recorded in airborne radiometric surveys are attenuated, first by the surface materials wherein they originate, then by the intervening atmosphere. Increased ground-clearance thus entails reduced count-rates. It also implies diminished spatial resolution, because the same cone of incident radiation derives from progressively larger ?footprints? that, for a given sampling rate, increasingly overlap. But suitable post-processing of the gridded, two-dimensional imagery can be used to correct these types of height-dependent degradation and hence produce sharper, quantitatively useful maps of radioactive isotope distribution. An essential prerequisite for such inverse filtering is noise-suppression, achieved here through maximum-noise-fraction (MNF) transformation of multi-channel data. High-frequency noise amplified by the deconvolution step is brought under control by a variant of Wiener filtering. The combined de-noising and deconvolution process is illustrated by application to an airborne gamma-ray survey from the Marble Bar area, Western Australia.

    Original languageEnglish
    Pages (from-to)161-166
    Number of pages6
    JournalExploration Geophysics
    Volume30
    Issue number4
    DOIs
    Publication statusPublished - 1999

    Keywords

    • Deconvolution
    • Gamma-radiometry
    • Inverse filtering
    • Wiener filter

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