Gamma ray logging of drill holes. Part 1, The logging instrument
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A geophysical instrument has been developed that is of value locating new ore deposits and in establishing the reserves of radioactive minerals. This instrument gives a permanent quantitative record of the gamma-ray activity in a vertical or steeply-dipping diamond and jackhammer drill holes. The practicability of the instrument has been demonstrated in logging several thousand feet of drill hole in the carnotite areas of the Colorado Plateau under a variety of rugged field conditions. This report describes the instrument and presents a summary of the procedure followed in field applications.