Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 184 R. W. CLARK AND HOLBROOK G. BOTSET off the dome for at least 3^ mile, and the radon content was still practically as high as was found in the producing area. This seemed to indicate that the presence of oil had little to do with the radio- activity of the soil. Knowing the association of radioactivity with heavy minerals,1 it was decided to make another profile parallel to and near the first and to take samples of the soil from the bottom of each hole. The
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 184 R. W. CLARK AND HOLBROOK G. BOTSET off the dome for at least 3^ mile, and the radon content was still practically as high as was found in the producing area. This seemed to indicate that the presence of oil had little to do with the radio- activity of the soil. Knowing the association of radioactivity with heavy minerals,1 it was decided to make another profile parallel to and near the first and to take samples of the soil from the bottom of each hole. These samples were taken to the laboratory for quantitative determination of their heavv mineral content. PRODUCING AREA 0 300 000 720 640 960 12 00 1320 FEET Fig. 3.—Radon profile across South Liberty salt dome. HEAVY MINERAL SEPARATION About 30 grams of each of these samples were ground to pass a 130-mesh sieve. The heavy minerals were first separated by using bromoform in a separatory funnel. This bromoform had a density, as determined by the pyknometer, of It was found, however, that the heavy mineral fraction obtained by this separation contained quartz and calcite. Consequently, this heavy mineral fraction was again separated, Thoulet's solution (density ) being used. This gave a very complete separation and was adopted as standard pro- cedure. 1 E. H. Biichner, Radioakt., Vol. 10 (1913), p. 516. W. Waters, Phil. Mag., Vol. 19 (1910), p. 903. R. H. Strutt, Proc. Roy. Soc, Vol. 84 (1910), p. 377. A. Gockel, Die Radioaktivitat von Boden und Quellen (Braunschweig, 1914). St. Meyer and Schweidler, Radioaktivitat (Leipsic, 1927). 514
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