Spectral component analysis applied to portable gamma ray spectrometry

R.L. Grasty

doi:10.1071/ASEG2001ab048

ISSN: 2202-0586
E-ISSN:

oa Spectral component analysis applied to portable gamma ray spectrometry
Authors R.L. Grasty^a
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^a Gamma-Bob Inc., , Canada, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2001ab048
- Published online: 01 Dec 2001

Abstract

Spectral component analysis is commonly applied to airborne gamma ray spectral data to reduce statistical noise in the measurements of potassium, uranium and thorium. This technique has been applied to continuous 5-second ground measurements with a portable gamma ray spectrometer using a 7.6 cm x 7.6 cm (3 inch x 3 inch) sodium iodide detector. The results have shown that the reduction in statistical noise is much greater than for large airborne detectors. Even with a short sampling time of 5-seconds, continuous ground measurements have practical significance for both geological mapping and mineral exploration.

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2001-12-01

2026-01-25

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References

Grasty, R.L., Holman, P.B. and Blanchard, Y.B., 1991, Transportable calibration pads for ground and airborne gamma ray spectrometers: Geological Survey of Canada Report 90-23.
Grasty, R.L., Hovgaard, J. and LaMarre, J. 2001, Calibration of a 7.6 cm x 7.6 cm (3 inch x 3 inch) sodium iodide spectrometer for measuring air kerma rate: Radiation Protection Dosimetry (in press).
Hovgaard, J. and Grasty R.L., 1997, Reducing statistical noise in airborne gamma ray data through spectral component analysis: Proceedings of Exploration 97: Fourth Decennial International Conference on Mineral Exploration. Toronto, 753-764.
IAEA, 1989, Construction and use of calibration facilities for radiometric field equipment: Technical Report No. 309, International Atomic Energy Agency, Vienna, Austria.
Minty, B., and McFadden, P., 1998. Improved NASVD smoothing of airborne gamma-ray spectra. Exploration Geophysics, 29, 516-523.

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Article Type: Research Article

Keyword(s): gamma ray spectrometry; geological mapping; ground surveys; mineral exploration; statistical noise

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