The uranium mining industry increasingly relies on analysis of geophysical logs to obtain geological and engineering information. A multipurpose logging system has been developed by the U. S. Atomic Energy Commission to support its raw materials program. Digital and/or analog records of nuclear, caliper, and electric logs are made on-site and records from other logging systems are semi-automatically digitized in the office. Quantitative analysis of the natural gamma-ray log is based on the proportionality between the area under the log curve and the product of the mean grade and thickness of a radioactive layer. Rock density and related parameters are calculated from gamma-gamma logs. Calibration and correction factors are determined from full-scale model holes. GAMLOG and RHOLOG, programs written in FORTRAN II for the IBM 7090 computer, are used to quantitatively interpret natural gamma-ray and gamma-gamma logs to obtain grade, thickness, and bulk density. Subroutines provide for correcting input data for instrument dead time, nonstandard hold conditions, disequilibrium, source decay, and for accepting additional data and constants to calculate dry density, porosity, and moisture, and for obtaining averages of these parameters for selectable intervals. Output is printed in tabular form.

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