Gamma ray logging is a method of measuring naturally occurring gamma radiation to characterize the rock or sediment in a borehole or drill hole. It is a wireline logging method used in mining, mineral exploration, water-well drilling, for formation evaluation in oil and gas well drilling and for other related purposes. Different types of rock emit...
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http://en.wikipedia.org/wiki/Gamma_ray_logging
(from the article `Earth exploration`) Information about the mineral composition and physical properties of a rock formation can be obtained by means of gamma-ray logging, a technique that ... ...lowered together in the form of a package. Common logging techniques include the following. The spontaneous potential log measures the natural...
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http://www.britannica.com/eb/a-z/g/6
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