A Geiger-Mller counter in a watertight container, lowered into a borehole to log the intensity of the gamma rays emitted by radioactive substances in traversed rock. Also known as electronic logger; Geiger probe.


Related Terms

PITOMETER LOG

A log consisting essentially of a pitot tube projecting into the water, and suitable registering devices.

PERCENTAGE LOG

A sample log in which the percentage of each type of rock (except obvious cavings) present in each sample of cuttings is estimated and plotted.

LIMESTONE LOG

A log that employs an electrical resistivity element in the form of four symmetrically arranged current electrodes to give accurate readings in borehole surveying of hard formations.

HARPOON LOG

A log which consists of a rotator and distance registering device combined in a single unit, which is towed through the water. The TAFFRAIL LOG is similar except that the registering device is located at the taffrail, with only the rotator in the water.

LOG

1. A record of courses or operation. 2. A device to measure speed.

STW

Speed through (the) water, speed of the vessel relative to the surrounding water (and as shown by a Log).

log

logarithm (common).

BEARING BOOK

A log for the recording of visual bearings

BELL BOOK

The log of ordered engine speeds and directions

LOG CHIP

The wooden quadrant forming part of a chip log. Also called LOG SHIP.

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