The Standardisation of Airborne Gamma-Ray Surveys in Australia

R. L. Grasty; B. R. S. Minty

doi:10.1071/EG995276

ISSN: 0812-3985
E-ISSN: 1834-7533

The Standardisation of Airborne Gamma-Ray Surveys in Australia
Authors R. L. Grasty^a and B. R. S. Minty^b
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^a Australian Geological Survey of Canada, 601 Booth St, Ottawa, , Canada, K1A0E8, (on assignment with the Australian Geological Survey Organisation ^b Australian Geological Survey Organisation, GPO Box 378 Canberra, , ACT, , 2601, Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 26, Issue 2-3, Jun 1995, p. 276 - 283
DOI: https://doi.org/10.1071/EG995276
- Published online: 01 Jun 1995

Abstract

In the last few years, the use of airborne gamma-ray spectrometry for geological mapping and mineral exploration has shown considerable growth. With this growth there has developed an increasing need to standardise the airborne measurements so that they will be independent of survey parameters. This paper describes the various calibration and processing procedures that have to be followed to achieve this goal through the conversion of the airborne measurements to ground concentrations of potassium, uranium and thorium. One of the most critical steps in this process is in the use of airborne calibration ranges whose potassium, uranium and thorium content must be measured at the time of the calibration flights. Two calibration ranges have been set up in South Australia and Queensland. However, these ranges are radioactively inhomogeneous which has made this calibration task more complicated than it otherwise would have been.

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References

Aviv, R., and Vulcan, U., 1983, Airborne gamma-ray survey over Israel: the methodology of the calibration of the airborne system: Israel Atomic Energy Commission, Report No. Z.D. 58/82.
Grasty, R.L., Wilkes, P.G., and Kooyman, R., 1988, Background measurements in gamma-ray surveys: Geological Survey of Canada, Paper 8811.
Green, A.A., 1987, Levelling airborne gamma-radiation data using between-channel correlation information: Geophysics, 52, 1557-1562.
IAEA, 1991, Airborne gamma ray spectrometer surveying: Technical Report Series, no. 323, International Atomic Energy Agency, Vienna, 1991.
Markkanen, M., Arvela, H., 1992, Radon emanation from soils: Radiation Protection Dosimetry, Vol. 45 No. 1/4 pp. 269-272.
Minty, B.R.S., 1992, Airborne gamma-ray spectrometric background estimation using full spectrum analysis: Geophysics, 57, 279-287.
Minty B.R.S. and Kennett B.L.N., 1995, Optimum channel combinations for multichannel airborne gamma-ray spectrometry. Exploration Geophysics, this volume.
Rogers, V.C., Nielson, K.K and Kalkwarf, D.R., 1984, Radon attenuation handbook for uranium mill tailings cover design: National Technical Information Service, U.S. Dept. of Commerce, NUREG/CR-3533.

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Article Type: Research Article

Keyword(s): Airborne gamma-ray spectrometry; calibration ranges; gamma-ray spectrometry; spectrometer calibration; test strips

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The Standardisation of Airborne Gamma-Ray Surveys in Australia

Abstract

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