Technique for correcting for overburden effects in ground level radiometric surveys of uranium ore bodies

Geophysics ◽  
1979 ◽  
Vol 44 (1) ◽  
pp. 89-98 ◽  
Author(s):  
B. L. Dickson ◽  
G. J. Clark ◽  
B. J. McGregor
Keyword(s):  
Experimental Study ◽  
Count Rate ◽  
Gamma Ray ◽  
Ground Level ◽  
Spectral Shape ◽  
Correction Factors ◽  
High Count ◽  
Uranium Ore ◽  
Ore Bodies ◽  
Overburden Thickness

An experimental study of the effect of barren overburden on the gamma‐ray spectrum of uranium ore has been made. This has shown that counts in either of the two energy windows 0.56 to 0.64 MeV or 0.66 to 1.01 MeV may be used to correct for the decrease in total count rate as a result of overburden. The correction is limited to an overburden thickness‐density product of approximately [Formula: see text], which is equivalent to a correction factor of 16. Theoretical spectra have been modeled for a geometry similar to that used in the experiment and agree in the changes in spectral shape with overburden thickness. The calculations have also been used to evaluate the effects of ore thickness and to determine the useful limits of the correction factors. The method is mainly applicable to a mining environment where sufficiently high count rates exist.

Pile-up correction algorithm for high count rate gamma ray spectroscopy

2019 ◽  
Vol 151 ◽  
pp. 196-206
Author(s):  
M.E. Hammad ◽  
H. Kasban ◽  
R.M. Fikry ◽  
Moawad I. Dessoky ◽  
O. Zahran ◽  
...  
Keyword(s):  
Count Rate ◽  
Gamma Ray ◽  
Correction Algorithm ◽  
High Count ◽  
High Count Rate ◽  
Pile Up ◽  
Gamma Ray Spectroscopy

The upgraded JET gamma-ray cameras based on high resolution/high count rate compact spectrometers

2018 ◽  
Vol 89 (10) ◽  
pp. 10I116 ◽  
Author(s):  
D. Rigamonti ◽  
A. Broslawski ◽  
A. Fernandes ◽  
J. Figueiredo ◽  
L. Giacomelli ◽  
...  
Keyword(s):  
High Resolution ◽  
Count Rate ◽  
Gamma Ray ◽  
High Count ◽  
High Count Rate

Pile-up reconstruction algorithm for high count rate gamma-ray spectrometry

2013 ◽  
Author(s):  
T. Petrovič ◽  
M. Vencelj ◽  
M. Lipoglavšek ◽  
R. Novak ◽  
D. Savran
Keyword(s):  
Count Rate ◽  
Gamma Ray ◽  
Reconstruction Algorithm ◽  
Gamma Ray Spectrometry ◽  
High Count ◽  
High Count Rate ◽  
Pile Up

Optimization of gamma‐ray logging techniques for uranium

Geophysics ◽  
1980 ◽  
Vol 45 (2) ◽  
pp. 292-311 ◽  
Author(s):  
John G. Conaway ◽  
Quentin Bristow ◽  
Patrick G. Killeen
Keyword(s):  
Count Rate ◽  
Gamma Ray ◽  
Processing Parameters ◽  
Sampling Interval ◽  
High Count ◽  
Uranium Exploration ◽  
Depth Scale ◽  
Probe Velocity ◽  
Chart Paper ◽  
Deconvolution Techniques

In gamma‐ray logging for uranium exploration and evaluation, many factors affect the accuracy of the final processed log. This paper presents the results of a study of various logging and data processing parameters over which the logger can exercise control. These include probe velocity, sampling interval, detector length, and, in the case of analog recording, ratemeter time constant and chart paper depth scale. Numerous replications of gamma‐ray logs past the same sequence of radioactive zones varying one logging parameter at a time, combined with theoretical considerations, lead to some useful conclusions regarding the effects of those parameters on the accuracy and resolution of the logs, and the efficacy of deconvolution techniques under various conditions. In general, digital recording is preferable to analog recording because, with the latter, the accuracy of the computed grade‐thickness product can suffer as a result of the extra steps of converting count rate to an analog chart record and back again to digital form for processing. In the case of digital gamma‐ray logging for uranium, it appears that it is less important to log slowly for good statistical accuracy than it is to use a small sampling or digitization interval. Under the high count‐rate conditions encountered in uranium logging, the factors limiting the accuracy of the log are likely to be detector length (which limits spatial resolution) and geologic noise (e.g., inhomogeneities in the rock); logging more slowly does not remedy these problems. In cases where the recorded gamma‐ray flux is low, such as in lithologic correlation, it may still be necessary to log very slowly to achieve acceptable statistical reliability.

Digital Acquisition in High Count Rate Gamma-Ray Spectrometry

2016 ◽  
pp. 1-1 ◽  
Author(s):  
Stefan Korolczuk ◽  
Slawomir Mianowski ◽  
Jacek Rzadkiewicz ◽  
Pawel Sibczynski ◽  
Lukasz Swiderski ◽  
...  
Keyword(s):  
Count Rate ◽  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
High Count ◽  
High Count Rate

scholarly journals Automated Qualitative Element Analysis of EDS Spectra with Considering Pile-Up Distortions in High Count-Rate Modes

2011 ◽  
Vol 17 (S2) ◽  
pp. 1192-1193 ◽  
Author(s):  
F Eggert ◽  
T Elam ◽  
R Anderhalt ◽  
J Nicolosi
Keyword(s):  
Count Rate ◽  
High Count ◽  
Element Analysis ◽  
High Count Rate ◽  
Pile Up

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

Sign in / Sign up

Export Citation Format

Share Document