Short note: on the use of radioelement ratios to enhance gamma-ray spectrometric data
Brian MintyGeoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia. Email: Brian.Minty@ga.gov.au
Exploration Geophysics 42(1) 116-120 https://doi.org/10.1071/EG10011
Submitted: 6 April 2010 Accepted: 19 December 2010 Published: 25 February 2011
Abstract
Radioelement ratios are useful for mapping subtle variations in radiometric signatures in map data. But the conventional method for calculating radioelement ratios has the significant limitation that if just one of the radioelements comprising the ratio has a small spread of concentration estimates relative to its mean, then it will not contribute significantly to the ratio map. However, if both the numerator and denominator are first normalised to approximately the same mean and spread prior to ratioing, then they will contribute equally to the enhancement of the differences between them across the map area.
References
Darnley, A. G., 1972, Airborne gamma-ray survey techniques, in Uranium prospecting handbook: Institution of Mining & Metallurgy, pp. 174–211.Dodd, P. H., Droullard, R. F., and Lathan, C. P., 1969, Borehole logging methods for exploration and evaluation of uranium deposits, in L. W. Morley, ed., Mining and Groundwater Geophysics 1967, Geological Survey of Canada, Economic Geology Report 26, pp. 401–415.
Grant, J. A., 1998, Ten things the textbooks don’t tell you about processing and archiving airborne gamma-ray spectrometric data, in Current research 1998-D: Geological Survey of Canada, pp. 83–87.
IAEA, 1991, Airborne gamma-ray spectrometer surveying – Technical Report Series, No. 323: International Atomic Energy Agency.
Moxham, R. M., Foote, R. S., and Bunker, C. M., 1965, Gamma-ray spectrometer studies of hydrothermally altered rocks: Economic Geology and the Bulletin of the Society of Economic Geologists, 60, 653–671
| Gamma-ray spectrometer studies of hydrothermally altered rocks:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaF2MXktlyju7o%3D&md5=1b0db97b95467f1739b4be8d8f7abf89CAS |
Shives, R. B. K., Charbonneau, B. W., and Ford, K. L., 1997, The detection of potassic alteration by Gamma-Ray Spectrometry – Recognition of alteration related to mineralisation, in Proceedings of Exploration 97: Fourth decennial conference on mineral exploration, pp. 741–752.
Yeates, A. N., Wyatt, B. W., and Tucker, D. H., 1982, Application of gamma-ray spectrometry to prospecting for tin and tungsten granites, particularly within the Lachlan Fold Belt, New South Wales: Economic Geology and the Bulletin of the Society of Economic Geologists, 77, 1725–1738
| Application of gamma-ray spectrometry to prospecting for tin and tungsten granites, particularly within the Lachlan Fold Belt, New South Wales:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaL38XmtVSqt7g%3D&md5=88ee40d853cd4cca539558a4ba6f41daCAS |