Borehole gamma-ray spectrometer for uranium exploration

George, David C.; Evans, Hilton B.; Allen, James W.; Key, B.N.; Ward, Daniel L.; Mathews, Mark

doi:10.2172/6869171

Cited by 5 publications

(5 citation statements)

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“…In a borehole logging situation, statistical accuracy depends on four factors: (1) the actual gamma-ray flux density in the borehole; (2) the efficiency of the probe in detecting the gammarays; (3) the logging rate, or the speed at which the probe is moved; and (4) the filtering, or averaging, of the data as it is presented on the log. 1.…”

Section: Data Accuracymentioning

confidence: 99%

“…1. The gamma-ray flux density in the borehole is of course proportional to the concentrations of the radioactive elements in the borehole environment, but is reduced by casings and borehole fluids.…”

Section: Data Accuracymentioning

confidence: 99%

“…The implications of the statistical uncertainty include: (1) variation is decreased as logging speed is reduced; (2) relative accuracy improves as ore grade increases; (3) potass~um variation is strongly affected by both uran1um and thorium; and (4) uranium and thorium each affect the variation in estimation of the other. …”

Section: Data Accuracymentioning

confidence: 99%

“…These three elements and their daughter products constitute 98% of the radioactive elements which occur naturally. (1) The information obtained from KUT logging allows more accurate estimation of ore grade, particularly in the presence of thorium anomolies. The ability to distinguish potassium and thorium also allows features of lithology to be identified, and followed from hole to hole.…”

Section: Introductionmentioning

confidence: 99%

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Spectral Gamma-Ray (Kut) Borehole Logging

Young¹

1980

Proceedings of SPE Annual Technical Conference and Exhibition

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Natural gamma-ray borehole logging is a recognized technique for evaluating uranium deposits and providing lithographic data. Spectral gammaray (KUT) borehole logging is a refinement of the technique which catagorizes gamma-rays, according to their energies, as comin9 from Potassium (K), uranium (U), and thorium (T). This spectral information enhances the usefulness of the natural gamma-ray log by providing additional information on the composition of the formation producing the gamma-rays.KUT logging is particularly applicable to evaluation of low-grade uranium deposits, and to cases where thorium anomalies are suspected. The ability to identify potassium and thorium can also aid in the classification of many rock strata.Calibration of a spectral gamma-ray probe for proper sensitivity to gamma-ray energy is of particular concern in KUT logging. A means of continuously controlling the sensitivity of a KUT probe, using a computer and a manganese-54 reference source, is described.Evaluation of elemental concentrations of potassium, equivalent uranium, and equivalent thorium, involves applying a stripping matrix of nine factors to the raw count rate data from the probe. Both the raw count rate data and the concentration data can be plotted versus depth. This evaluation procedure and the calibration method which yields the stripping matrix are described. Accuracy of the data produced, and the effect of logging rate on accuracy, are also discussed.

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Section: Data Accuracymentioning

confidence: 99%

Section: Data Accuracymentioning

confidence: 99%

Section: Data Accuracymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spectral Gamma-Ray (Kut) Borehole Logging

Young¹

1980

Proceedings of SPE Annual Technical Conference and Exhibition

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“…During 1974During -1984, the U.S. Department of Energy (DOE) conducted a National Uranium Resource Evaluation (NURE) program that supported research and development related to borehole calibration standards (Steele and George, 1986;Leino et al, 1994), industry-standard calibration procedures and data analysis methods, and logging hardware (George et al, 1979).…”

Section: Introductionmentioning

confidence: 99%