Abundances of uranium, thorium, and potassium for some Australian crystalline rocks

Open-File Report 75-393
By: , and 



This report contains a tabulation of the basic radioelement and radiogenic heat data obtained during an Australian National University (ANU) - United States Geological Survey (USGS) heat-flow project, directed jointly by J. C. Jaeger (ANU) and J. H. Sass (USGS). Most samples were collected during the periods June through September, 1971 and 1972. The measurements were made subsequently by two of us (C. M. Bunker and C. A. Bush) using the gamma-ray spec trometric techniques described by Bunker and Bush (1966, 1967). Interpreting the spectra for quantitative analyses of the radioelements was accomplished with an iterative leastsquares computer program modified from one by Schonfeld (1966). Uranium content determined by gamma-ray spectrometry is based on a measurement of the daughter products of 226Ra. Equilibrium in the uranium-decay series was assumed for these analyses . Throughout the report, when U content is stated, radium-equivalent uranium is implied. The coefficient of variation for the accuracy of the radioelement data, when compared to ana lyses by isotope dilution and flame photometry is about 3 percent for radium-equivalent uranium and thorium and about 1 percent for potassium. These percentages are in addition to minimum standard deviations of about 0.05 ppm for U and Th, and about 0.03 percent for K.

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Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Abundances of uranium, thorium, and potassium for some Australian crystalline rocks
Series title Open-File Report
Series number 75-393
DOI 10.3133/ofr75393
Year Published 1975
Language English
Publisher U.S. Geological Survey
Description 39 p.
Country Australia
Online Only (Y/N) N
Additional Online Files (Y/N) N