Gamma-ray Spectrometry in Geothermal Exploration:  State of the Art Techniques

Alistair McCay; Thomas Harley; Paul Younger; David Sanderson; Alan Cresswell

doi:10.3390/en7084757

Gamma-ray Spectrometry in Geothermal Exploration: State of the Art Techniques

Energies ◽

10.3390/en7084757 ◽

2014 ◽

Vol 7 (8) ◽

pp. 4757-4780 ◽

Cited By ~ 17

Author(s):

Alistair McCay ◽

Thomas Harley ◽

Paul Younger ◽

David Sanderson ◽

Alan Cresswell

Keyword(s):

Gamma Ray ◽

State Of The Art ◽

Gamma Ray Spectrometry ◽

Geothermal Exploration ◽

Art Techniques

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HIGH SENSITIVITY GAMMA‐RAY SPECTROMETRY—STATE OF THE ART AND TRIAL APPLICATION OF FACTOR ANALYSIS

Geophysics ◽

10.1190/1.1440726 ◽

1977 ◽

Vol 42 (3) ◽

pp. 549-559 ◽

Cited By ~ 4

Author(s):

Joseph S. Duval

Keyword(s):

Factor Analysis ◽

Gamma Ray ◽

State Of The Art ◽

Mineral Exploration ◽

High Sensitivity ◽

Original Data ◽

Gamma Ray Spectrometry ◽

Similar Data ◽

Spectrometric Data ◽

Other Information

The remote sensing of terrestrial gamma rays has application in geologic mapping, mineral exploration, reactor site monitoring, location of lost radioactive sources, measurement of the water equivalence of snow, and soil mapping. Although the state of the art is quite good, there is a need to reexamine the use of detectors other than thallium activated sodium iodide detectors (e.g., plastic scintillators) to improve the corrections used for altitude variations and to present the data as apparent concentrations of potassium, uranium, and thorium rather than as counts per unit of time. In an attempt to improve data analysis, the technique known as factor analysis has been applied to airborne gamma‐ray spectrometric data from a survey in South Texas. This analysis technique allows the geologist/geophysicist to perform a coordinate transformation from the four count rates [potassium (K), equivalent uranium (eU), equivalent thorium (eTh), and total count] and the three ratios, (eU/K, eU/eTh, eTh/K) to a system of three independent coordinates. These three coordinates are constrained to reproduce the total variance of the original data, and the data can be separated into groups using the criterion that similar data points have similar coordinates. The distribution of the separated groups can be mapped for comparison with other information such as the mapped geology. This map of the groups represents a synthesis of all of the radiometric data.

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Gamma-Ray Spectrometric Analysis of Some Trace Elements in the Human Articular Disc of the Mandible

Nuklearmedizin ◽

10.1055/s-0037-1621214 ◽

1963 ◽

Vol 03 (02) ◽

pp. 175-182 ◽

Cited By ~ 1

Author(s):

Bo Bergman ◽

Rune Söremark

Keyword(s):

Trace Elements ◽

Neutron Activation ◽

Quantitative Data ◽

Thermal Neutron Flux ◽

Gamma Ray ◽

Dry Weight ◽

Gamma Ray Spectrometry ◽

Spectrometric Analysis ◽

Articular Disc ◽

Group Separation

SummaryBy means of neutron activation and gamma-ray spectrometry the concentrations in the human mandibular articular disc of the following elements have been determined: Na, Mn, Cu, Zn, Rb, Sr, Cd, W, and Au. The discs were obtained at necropsy from seven men and nine women, ranging in age from 56 to 71 years.The activation was carried out in a thermal neutron flux of about 1.7 XlO12 neutrons × cm−2 × sec.−1 for about 20 hours. A chemical group separationwas performed before the gamma-ray spectrometry. Quantitative data based on the dry weight of the cartilage samples were obtained by comparing the photo-peak area of the identified elements with those of appropriate standards.

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