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Gamma Ray Spectral Calculations For Uranium Borehole Logging
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Book Synopsis Gamma-ray Spectral Calculations for Uranium Borehole Logging by :
Download or read book Gamma-ray Spectral Calculations for Uranium Borehole Logging written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gamma-ray transport calculations were performed to determine the energy distribution of gamma rays inside a borehole introduced into an infinite medium. The gamma rays from the naturally occurring radioactive isotopes of potassium, thorium, and uranium were uniformly distributed in a sandstone formation (having a porosity of 0.30 and a saturation of 1.0) surrounding the borehole. A sonde was placed coaxially inside the borehole. Parametric studies were done to determine how the borehole radius, borehole fluid, and borehole casing influence the gamma-ray flux inside the sonde.
Book Synopsis Gamma-ray Spectral Calculations for Uranium Borehole Logging by : D. A. Close
Download or read book Gamma-ray Spectral Calculations for Uranium Borehole Logging written by D. A. Close and published by . This book was released on 1980 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Gamma-ray Logging III written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of borehole formation parameters on spectral gamma-ray probe response was calculated from radiation theory. Results are presented for the effect of formation bulk density and composition on the gamma-ray spectra from potassium, uranium, and thorium. Experimentally determined response functions are presented for spectral gamma-ray probes logging through thin horizontal beds of potassium, uranium, and thorium. Potassium and thorium thin-bed results were obtained by numerical differentiation of the probe response across the interface between a thick zone containing potassium or thorium and a thick barren zone. Uranium results were obtained both from differentiation of thick zone interface measurements and directly using thin bed uranium models. Measurements were performed by use of sodium iodide detectors of various sizes. Detector size and shape were found to have a larger effect on the thin-bed response function than did the formation parameters, which can affect the transport properties of the gamma rays. Results were used to deconvolve observed borehole logs and obtain concentration with depth for thin ore zones. 10 figures, 1 table.
Book Synopsis Spectral Gamma-ray Logging Studies by : Robert D. Wilson
Download or read book Spectral Gamma-ray Logging Studies written by Robert D. Wilson and published by . This book was released on 1981 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Borehole Model Calculations for Gamma-gamma Logging Tools by : William A. Woolson
Download or read book Borehole Model Calculations for Gamma-gamma Logging Tools written by William A. Woolson and published by . This book was released on 1980 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Borehole Gamma-ray Spectrometer for Uranium Exploration by : David C. George
Download or read book A Borehole Gamma-ray Spectrometer for Uranium Exploration written by David C. George and published by . This book was released on 1978 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Gamma-ray Logging II written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimentally determined factors are presented that correct spectral gamma-ray logs for the effects of varying borehole fluid and casing attenuation. These corrections are for gamma-ray spectra from the naturally radioactive isotopes of K, U, and Th. A sodium iodide spectral gamma-ray probe was used to collect data on the 1.46-MeV gamma ray from 4°K, the 1.76-MeV gamma ray from 214Bi (a decay product of 238U), and the 2.61-MeV gamma ray from 2°8Tl (a decay product of 232Th). Count rates for these gamma rays were measured for various borehole fluid and casing conditions. Borehole fluid corrections are presented for both centralized and sidewalled probe geometries for hole diameters from 3 to 12 inches. For a typical hole diameter of 4.5 inches and a probe diameter of 2.0 inches, the water correction is 23 percent for the potassium signal, and 15 percent for the uranium and thorium signals. For the smaller borehole diameters, the water correction is nearly independent of probe placement. As the borehole diameter increases to 12 inches, the correction for the uranium and thorium signals increases to 50 percent for the sidewalled geometry and to 100 percent for the centralized geometry. Gamma-ray transport calculations were performed to predict the effects of borehole water for the centralized probe geometry, and the resulting water factor corrections are somewhat lower than the measured values. The difference is attributed to the fact that detector response has not yet been included in the calculations. Casing corrections are presented for dry boreholes with thicknesses of steel casing from 1/16 inch to 1/2 inch. The data are fit reasonably well with exponential curves having effective linear attenuation coefficients of 1.26 inch−1 for U and 1.03 inch−1 for Th. 12 figures, 9 tables.
Book Synopsis A New Computationally-efficient Computer Program for Simulating Spectral Gamma-ray Logs by :
Download or read book A New Computationally-efficient Computer Program for Simulating Spectral Gamma-ray Logs written by and published by . This book was released on 1995 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several techniques to improve the accuracy of radionuclide concentration estimates as a function of depth from gamma-ray logs have appeared in the literature. Much of that work was driven by interest in uranium as an economic mineral. More recently, the problem of mapping and monitoring artificial gamma-emitting contaminants in the ground has rekindled interest in improving the accuracy of radioelement concentration estimates from gamma-ray logs. We are looking at new approaches to accomplishing such improvements. The first step in this effort has been to develop a new computational model of a spectral gamma-ray logging sonde in a borehole environment. The model supports attenuation in any combination of materials arranged in 2-D cylindrical geometry, including any combination of attenuating materials in the borehole, formation, and logging sonde. The model can also handle any distribution of sources in the formation. The model considers unscattered radiation only, as represented by the background-corrected area under a given spectral photopeak as a function of depth. Benchmark calculations using the standard Monte Carlo model MCNP show excellent agreement with total gamma flux estimates with a computation time of about 0.01% of the time required for the MCNP calculations. This model lacks the flexibility of MCNP, although for this application a great deal can be accomplished without that flexibility.
Book Synopsis U.S. Geological Survey Circular by :
Download or read book U.S. Geological Survey Circular written by and published by . This book was released on 1984 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Borehole Geophysics as Applied to Ground-water Hydrology by : Ticie A. Taylor
Download or read book Bibliography of Borehole Geophysics as Applied to Ground-water Hydrology written by Ticie A. Taylor and published by . This book was released on 1985 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Borehole Logging for Uranium Exploration by : International Atomic Energy Agency
Download or read book Borehole Logging for Uranium Exploration written by International Atomic Energy Agency and published by Bernan Press(PA). This book was released on 1982 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Borehole Model Calculations for Direct Uranium Measurement with Neutrons by : William A. Woolson
Download or read book Borehole Model Calculations for Direct Uranium Measurement with Neutrons written by William A. Woolson and published by . This book was released on 1977 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Conterminous United States Mineral Appraisal Program by : Ticie A. Taylor
Download or read book The Conterminous United States Mineral Appraisal Program written by Ticie A. Taylor and published by . This book was released on 1984 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Calculation of Borehole Correctrion Factors for Gamma-ray Spectral Logging by : Michael L. Evans
Download or read book Calculation of Borehole Correctrion Factors for Gamma-ray Spectral Logging written by Michael L. Evans and published by . This book was released on 1983 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gamma-ray Logging Techniques in Uranium Exploration by : R. F. Drollard
Download or read book Gamma-ray Logging Techniques in Uranium Exploration written by R. F. Drollard and published by . This book was released on 1958 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Calculation of Borehole Correction Factors for Gamma-ray Spectral Logging by : Michael Lynn Evans
Download or read book Calculation of Borehole Correction Factors for Gamma-ray Spectral Logging written by Michael Lynn Evans and published by . This book was released on 1982 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Information Circular written by and published by . This book was released on 1973 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
