Temperatures and natural gamma-ray logs obtained in 1986 from Shady Rest drill hole RD08, Mammoth Lakes, Mono County, California

1987 ◽  
Author(s):  
T.C. Urban ◽  
W.H. Diment ◽  
M.L. Sorey
Keyword(s):  
Gamma Ray ◽  
Drill Hole ◽  
Natural Gamma ◽  
Mammoth Lakes

URANIUM ASSAY LOGGING USING A PULSED 14‐MEV NEUTRON SOURCE AND DETECTION OF DELAYED FISSION NEUTRONS

Geophysics ◽  
1976 ◽  
Vol 41 (3) ◽  
pp. 468-490 ◽  
Author(s):  
W. W. Givens ◽  
W. R. Mills ◽  
C. L. Dennis ◽  
R. L. Caldwell
Keyword(s):  
Gamma Ray ◽  
Drill Hole ◽  
Fission Neutron ◽  
Neutron Counter ◽  
Natural Gamma ◽  
Uranium Assay ◽  
Exploration And Production ◽  
Fission Neutrons ◽  
Neutron Burst ◽  
Ore Grade

An in‐situ uranium assay logging system has been developed that measures directly and quantitatively the uranium concentration in the formation surrounding a drill hole. System operation is based on the DFN (delayed fission neutron) method which involves (1) bombarding a formation with short duration bursts of neutrons from a pulsed‐neutron generator to induced fission in any uranium present; (2) separating delayed fission neutrons, from source and prompt fission neutrons, by waiting a few milliseconds after each neutron burst before activating the neutron counter system; (3) deactivating the neutron counter system before the beginning of the next neutron burst; and (4) repeating this bombard‐wait‐count cycle a sufficient number of times to accumulate a statistically acceptable number of the delayed neutron counts. The DFN logging method has been used routinely in our field operations for several years, and it has successfully overcome one of the most perplexing problems encountered in uranium exploration and production—that of radioactive disequilibrium. The need for coring and chemical assaying is virtually eliminated. The information provided by chemical assay of cores is made available by DFN assays on site and in minutes after the data are accumulated. The disequilibrium ratio is available to the field geologist immediately by comparing DFN assay ore grade to ore grade from a calibrated natural gamma‐ray log. A DFN uranium assay logging system is capable of 8 ft/minute continuous semiquantitative logs and stationary quantitative assays. Calibration procedures and a method for correcting DFN assays for variable formation parameters, such as porosity and macroscopic absorption cross‐section, have been developed. DFN logs, assays, and chemical assays of cores are in excellent agreement.

Elemental analysis using natural gamma-ray spectroscopy

1994 ◽  
Vol 353 (1-3) ◽  
pp. 558-561 ◽  
Author(s):  
A. Aksoy ◽  
A.A. Naqvi ◽  
F.Z. Khiari ◽  
F. Abujarad ◽  
M. Al-Ohali ◽  
...  
Keyword(s):  
Elemental Analysis ◽  
Gamma Ray ◽  
Natural Gamma ◽  
Gamma Ray Spectroscopy

Quaternary chronostratigraphic framework and sedimentary processes for the Gulf of Cadiz and Portuguese Contourite Depositional Systems derived from Natural Gamma Ray records

2016 ◽  
Vol 377 ◽  
pp. 40-57 ◽  
Author(s):  
Johanna Lofi ◽  
Antje Helga Luise Voelker ◽  
Emmanuelle Ducassou ◽  
F. Javier Hernández-Molina ◽  
Francisco J. Sierro ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gulf Of Cadiz ◽  
Sedimentary Processes ◽  
Natural Gamma ◽  
Gulf Of Cádiz ◽  
Depositional Systems

scholarly journals A python code for automatic construction of Fischer plots using proxy data

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daming Yang ◽  
Yongjian Huang ◽  
Zongyang Chen ◽  
Qinghua Huang ◽  
Yanguang Ren ◽  
...  
Keyword(s):  
Data Processing ◽  
Open Source ◽  
Lake Level ◽  
Gamma Ray ◽  
Data Series ◽  
Proxy Data ◽  
Cycle Number ◽  
Automatic Construction ◽  
Natural Gamma ◽  
Graphic Representations

AbstractFischer plots are widely used in paleoenvironmental research as graphic representations of sea- and lake-level changes through mapping linearly corrected variation of accumulative cycle thickness over cycle number or stratum depth. Some kinds of paleoenvironmental proxy data (especially subsurface data, such as natural gamma-ray logging data), which preserve continuous cyclic signals and have been largely collected, are potential materials for constructing Fischer Plots. However, it is laborious to count the cycles preserved in these proxy data manually and map Fischer plots with these cycles. In this paper, we introduce an original open-source Python code “PyFISCHERPLOT” for constructing Fischer Plots in batches utilizing paleoenvironmental proxy data series. The principle of constructing Fischer plots based on proxy data, the data processing and usage of the PyFISCHERPLOT code and the application cases of the code are presented. The code is compared with existing methods for constructing Fischer plots.

Natural Gamma Ray Tool Response Discrepancies: Not Always Due to the Calibration!

2018 ◽  
Author(s):  
Françoise Allioli ◽  
Luisa Nicoletti ◽  
Christian Stoller ◽  
Libai Xu
Keyword(s):  
Gamma Ray ◽  
Natural Gamma

Use of Natural Gamma Ray Spectral Logging in Evaluation of Clay Minerals

1982 ◽  
Vol 6 (4) ◽  
pp. 335-360 ◽  
Author(s):  
Walter H. Fertl ◽  
George V. Chilingarian ◽  
T. F. Yen
Keyword(s):  
Clay Minerals ◽  
Gamma Ray ◽  
Natural Gamma
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