Most geophysical methods of oil-prospecting do not show the oil itself. All they show are underground structures that may or may not contain oil. Often the wells drilled into them reach nothing of value.
Chemical and Engineering News tells about a prospecting system that seems to point to the oil itself. Prospector Hans Lundberg of Toronto surveys an oil-promising territory by flying back & forth across it in an airplane equipped with a scintillometer* to count the low-energy gamma rays coming up from the earth.
The radioactivity varies a good deal, but its intensity is unusually low directly over an. oil or gas...
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