Skip to main content

gamma—gamma sonde

gamma—gamma sonde A well-logging instrument package in which a source of gamma radiation, usually 2760Co or 137Cs, bombards the wall of the borehole, and the backscatter of gamma rays, together with natural radiation, is recorded some 45 cm above the source. The record is known as a density log, as the backscatter is an exponential function of electron density in the rocks. Mostly the instrument responds to the nearest 10 cm of rock wall. Sometimes two detectors are used at different locations to distinguish between mud cake and rock.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"gamma—gamma sonde." A Dictionary of Earth Sciences. . Encyclopedia.com. 20 Sep. 2018 <http://www.encyclopedia.com>.

"gamma—gamma sonde." A Dictionary of Earth Sciences. . Encyclopedia.com. (September 20, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/gamma-gamma-sonde

"gamma—gamma sonde." A Dictionary of Earth Sciences. . Retrieved September 20, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/gamma-gamma-sonde

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.