The 3D inversion of airborne gamma-ray spectrometric data

Brian Minty; Ross Brodie

doi:10.1071/ASEG2015ab129

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa The 3D inversion of airborne gamma-ray spectrometric data
Authors Brian Minty^a and Ross Brodie^b
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^a Minty Geophysics, GPO Box 3299 Weston, , ACT, , 2611, Australia, [email protected] ^b Geoscience Australia, GPO Box 378 Canberra, ACT, 2601, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab129
- Published online: 01 Dec 2015

Abstract

We present a new method for the inversion of airborne gamma-ray spectrometric line data to a regular grid of radioelement concentration estimates on the ground. The method incorporates the height of the aircraft, the 3D terrain within the field of view of the spectrometer, the directional sensitivity of rectangular detectors, and a source model comprising vertical rectangular prisms with the same horizontal dimensions as the required grid cell size. The top of each prism is a plane surface derived from a best-fit plane to the digital elevation model of the earth’s surface within each grid cell area.

The method is a significant improvement on current methods, and gives superior interpolation between flight lines. It also eliminates terrain effects that would normally remain in the data with the use of conventional gridding methods.

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2026-01-16

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References

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The 3D grid shows better continuity of anomalies and interpolation between flights. The positions of the flight lines are evident in the minimum curvature grid as E-W lines of high-frequency speckle corresponding to the original observation points.
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Article Type: Research Article

Keyword(s): deconvolution; gamma-ray spectrometry; inversion; radiometrics

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