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A process whereby gamma rays naturally emitted by formations traversed by
a borehole are measured. A tool containing a radiation detector is lowered
into the borehole and gamma ray measurements are transmitted to the
Earth's surface. The signals are utilized to produce a record of gamma
rays detected in correlation with the depth of the detector in the
borehole. The record thus obtained in the form of a curve indicating
relative number per unit of time of natural gamma rays at different
depths, is a conventional natural gamma-ray log, sometimes simply called a
gamma-ray log. Williams
Source:
Dictionary of Mining, Mineral, and Related Terms
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