Summary
Gamma-ray logging has evolved from a qualitative estimation of the variation of natural radioactivity with depth in a borehole, using a Geiger-Müller detector, to a sophisticated quantitative logging technique which yields information on the identification and amount of the radioelements present, as well as data on the likely geologic history of mobilisation of these radioelements in the rock. To extract this additional information, a keener appreciation of the natural radioactive decay series, the isotopes involved, their half-lives, the energies of their gamma-rays and the interaction of these gamma-rays with the rock through which they travel is necessary. This has led to the development of improved data acquisition systems (digital logging systems), new methods of data processing (application of digital time series analysis—inverse filtering), the introduction of gamma-ray spectral logging, and improvements in variety and type of detectors to enhance the logging measurements and facilitate the new data processing techniques. Many of the new developments relate primarily to uranium exploration problems but they also have ramifications in other geologic applications of gamma-ray logging.
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References
BOYNTON, G. R. (1975). Canister cryogenic system for cooling germanium semiconductor detectors in borehole and marine probes, Nuclear Instruments and Methods, 123, 599–603.
BRISTOW, Q. (1979). Airborne and vehicle mounted geophysical data acquisition system controlled by Nova minicomputers, in Proceedings of the 6th Annual Data General User’s Group Meeting, New Orleans, Dec. 4–7.
BRISTOW, Q. and KILLEEN, P. G. (1978). A new computer-based gamma ray spectral logging system, in Geophysics Golden Gateway to Energy, 49th Annual Meeting of the SEG (Abstract), pp. 117–18.
BRISTOW, Q., CONAWAY, J. G. and KILLEEN, P. G. (in press). Application of inverse filtering to gamma-ray logs: A case study, Geophysics.
CHRISTELL, R., LJUNGGREN, K. and LANDSTROM, O. (1976). Brief review of developments in nuclear geophysics in Sweden, Nuclear Techniques in Geochemistry and Geophysics, Proc. Series IAEA, Vienna, p. 21–46.
CONAWAY, J. G. (1978). Problems in gamma-ray logging: thin zone correction factors, in Current Research, Part C, Geol. Surv. Can., Paper 78–1C, pp. 19–21.
CONAWAY, J. G. (1979a). Problems in gamma-ray logging: the effect of dipping beds on the accuracy of ore grade determinations, in Current Research, Part A, Geol. Surv. Can., Paper 79–1A, pp. 41–4.
CONAWAY, J. G. (1979b). Computer processing of gamma-ray logs: a program for the determination of radioelement concentrations, in Current Research, Part B, Geol. Surv. Can., Paper 79–1B, pp. 27–32.
CONAWAY, J. G. (1980a). Exact inverse filters for the deconvolution of gamma-ray logs, Geoexploration, 18, 1–14.
CONAWAY, J. G. (1980B). Direct determination of the gamma-ray logging system response function in field boreholes, Geoexploration 18, 187–99.
CONAWAY, J. G. (1980c). Uranium concentrations and the system response function in gamma-ray logging, in Current Research, Part A, Geol. Surv. Can. Paper80–1A pp. 77–87.
CONAWAY, J. G. (1981). Deconvolution of gamma-ray logs in the case of dipping radioactive zones, Geophysics 46(2), 198–202.
CONAWAY, J. G. and BRISTOW, Q. (1981). Pitfalls in quantitative gamma-ray logging: Calibration sleeves and Am-241 temperature stabilization, Society of Professional Well Log Analysts 22nd Annual Logging Symposium Transactions, Mexico City.
CONAWAY, J. G. and KILLEEN, P. G. (1978a). Quantitative uranium determinations from gamma-ray logs by application of digital time series analysis, Geophysics 43(6), 1204–21.
CONAWAY, J. G. and KILLEEN, P. G. (1978b). Computer processing of gamma-ray logs: iteration and inverse filtering, in Current Research, Part B, Geol. Surv. Can. Paper 78–1B, pp. 83–8.
CONAWAY, J. G. and KILLEEN, P. G. (1980). Gamma-ray spectral logging for uranium, Can. Inst. Mining Metall. Bull. 73(813), 115–23.
CONAWAY, J. G., ALLEN, K. V., BLANCHARD, Y. B., BRISTOW, Q., HYATT, W. G. and KILLEEN, P. G. (1979). The effects of borehole diameter, borehole fluid, and steel casing thickness on gamma-ray logs in large diameter boreholes, in Current Research, Part C, Geol Surv. Can. Paper 79–1C, pp. 37–40.
CONAWAY, J. G., BRISTOW, Q. and KILLEEN, P. G. (1980a). Optimization of gamma-ray logging techniques for uranium, Geophysics 45(2), 292–311.
CONAWAY, J. G., KILLEEN, P. G. and BRISTOW, Q. (1980b). Variable formation parameters and nonlinear errors in quantitative borehole gamma-ray log interpretation, in Technical Program, Abstracts and Biographies, 50th Annual International Meeting of the SEG (Abstract), pp. 121–2.
CONAWAY, J. G., KILLEEN, P. G. and HYATT, W. G. (1980c). A comparison of bismuth germanate, cesium iodide, and sodium iodide scintillation detectors for gamma-ray spectral logging in small diameter boreholes, in Current Research, Part B, Geol. Surv. Can, Paper 80–1B, pp. 173–7.
CZUBEK, J. A. (1971). Differential interpretation of gamma-ray logs: I. Case of the static gamma-ray curve, Report No. 760/1, Nuclear Energy Information Center, Polish Government Commissioner for Use of Nuclear Energy, Warsaw, Poland.
CZUBEK, J. A. (1972). Differential interpretation of gamma-ray logs: II. Case of the dynamic gamma-ray curve, Report No. 793/1, Nuclear Energy Information Center, Polish Government Commissioner for Use of Nuclear Energy, Warsaw, Poland.
DAVYDOV, Y. B. (1970). Odnomernaya obratnaya zadacha gamma-karotazha skvazhin (One dimensional inversion problem of borehole gamma logging), Izvestiya Vysshoya Uchebnoye Zavedeniya Geologiya i Razvedka No. 2, 105–9 (in Russian).
DODD, P. H. and ESCHLIMAN, D. H. (1972). Borehole logging techniques for uranium exploration and evaluation, in Uranium Prospecting Handbook Ed. S. H. U. Bowie, M. Davis and D. Ostle. Inst. Min. Metal., London, pp. 244–76.
GEORGE, D. C, EVANS, H. B., ALLEN, J. W., KEY, B. N, WARD, D. L. and MATHEWS, M. A. (1978). A borehole gamma-ray spectrometer for uranium exploration, US Dept. of Energy, Grand Junction Office, Report GJBX-82(78).
GORBATYUK, O. V, KADISOV, E. M., MILLER, V. V. and TROITSKII, S. G. (1973). Possibilities of determining uranium and radium content of ores by measuring gamma radiation in a borehole using a spectrometer with a Ge(Li) detector, Translated from Atomnaya Energiya, 35(5), 355–7, Nov. 1973: Consultants Bureau, Plenum Publishing Co., New York.
GRASTY, R. L. (1977). A general calibration procedure for airborne gamma-ray spectrometers, in Report of Activities, Part C, Geol Surv. Can. Paper 77–1C, pp. 61–2.
GRASTY, R. L. (1979). Gamma-ray spectrometric methods in uranium exploration: Theory and operational procedures, in Geophysics and Geochemistry in the Search for Metallic Ores Geol. Surv. Can., Econ. Geol. Rep. 31, pp. 147–61.
Hsu, H. P. (1970). Fourier analysis. Simon and Schuster, New York.
KANASEWICH, E. R. (1973). Time Sequence Analysis in Geophysics. University of Alberta Press, Calgary.
KILLEEN, P. G. (1976). Portable borehole gamma-ray spectrometer tests, in Report of Activities, Part A, Geol. Surv. Can. Paper 76–1A, pp. 487–9.
KILLEEN, P. G. (1978). Gamma-ray spectrometric calibration facilities—a preliminary report, in Current Research, Part A, Geol Surv. Can. Paper 78–1A, pp. 243–7.
KILLEEN, P. G. (1979). Gamma-ray spectrometric methods in uranium exploration—application and interpretation, in Geophysics and Geochemistry in the Search for Metallic Ores Geol. Surv. Can., Econ. Geol. Rep. 31, pp. 163–229.
KILLEEN, P. G. and BRISTOW, Q. (1976). Uranium exploration by borehole gamma-ray spectrometry using off-the-shelf instrumentation, in Exploration for Uranium Ore Deposits, Proc. Series IAEA, Vienna, pp. 393–414.
KILLEEN, P. G. and CONAWAY, J. G. (1978). New facilities for calibrating gamma-ray spectrometric logging and surface exploration equipment, Can. Inst. Mining Met all Bull, 71(793), 84–7.
KILLEEN, P. G., CONAWAY, J. G. and BRISTOW, Q. (1978). A gamma-ray spectral logging system including digital playback, with recommendations for a new generation system, in Current Research, Part A, Geol Surv. Can. Paper 78–1A, pp. 235–41.
LAUBER, A. and LANDSTROM, O. (1972). A Ge(Li) borehole probe for in situ gamma-ray spectrometry, Geophys. Prospect. 20 800–13.
MATHEWS, M. A., KOIZUMI, C. J. and EVANS, H. B. (1978). DOE—Grand Junction logging model data synopsis, US Dept. of Energy, Grand Junction Office, Report GJBX-76(78).
ROBINSON, E. A. (1967). Multichannel time series analysis with digital computer programs Holden-Day, San Francisco.
ROSHOLT, J. N., JR. (1959). Natural radioactive disequilibrium of the uranium series, US Geol Surv. Bull 1084-A, pp. 1–30.
SCOTT, J. H. (1963). Computer analysis of gamma-ray logs, Geophysics 28(3), 457–65.
SCOTT, J. H. (1980). Pitfalls in determining the dead time of nuclear well-logging probes, Society of Professional Well Log Analysts 21st Annual Logging Symposium Transactions Paper H, pp. 1–11.
SCOTT, J. H., DODD, P. H., DROULLARD, R. F. and MUDRA, P. J. (1961). Quantitative interpretation of gamma-ray logs, Geophysics 26(2), 182–91.
SENFTLE, F. E., MOXHAM, R. M., TANNER, A. B., BOYNTON, G. R., PHILBIN, P. W. and BAICKER, J. A. (1976). Intrinsic germanium detector used in borehole sonde for uranium exploration, Nuclear Instruments and Methods, 138, 371–80.
SMITH, A. R. and WOLLENBERG, H. A. (1972). High-resolution gamma-ray spectrometry for laboratory analysis of the uranium and thorium decay series, Proceedings of the Second International Symposium on the Natural Radiation Environment Houston, Texas, Ed., J. A. S. Adams, W. M. Lowder and T. F. Gesell. US Dept. of Commerce, Springfield, Virginia, pp. 181–231.
STROMSWOLD, D. C. and KOSANKE, K. L. (1979). Spectral gamma-ray logging I: Energy stabilization methods, Society of Professional Well Log Analysts 20th Annual Logging Symposium Transactions Paper DD, pp. 1–10.
SUPPE, S. A. and KHAIKOVICH, I. M. (1960). Resheniye pryamoi zadachi gamma-karotazha v sluchaye slozhnogo raspredeleniya radioaktivnogo elementa v aktivykh plastakh (Solution of the linear problem of gamma logging in the case of a complex distribution of the radioactive element in the active strata), Voprosy Rudnoi Geofiziki No. 1 (in Russian).
TANNER, A. B., MOXHAM, R. M. and SENFTLE, F. E. (1977). Assay for uranium and determination of disequilibrium by means of in situ high resolution gamma-ray spectrometry, US Geol. Surv. Open File Report 77–571.
WILSON, R. D. and STROMSWOLD, D. C. (1981). Spectral gamma-ray logging studies, Report prepared for US Dept. of Energy by Bendix Field Engineering Corporation, Grand Junction, Colorado, under contract No. DE-AC13-76GJ01664.
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Killeen, P.G. (1982). Gamma-Ray Logging and Interpretation. In: Fitch, A.A. (eds) Developments in Geophysical Exploration Methods—3. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7349-7_4
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DOI: https://doi.org/10.1007/978-94-009-7349-7_4
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